S C - 8 3 2 0 WESTERN DIGITAL NO MORE PRODUCED Native| Translation ------+-----+-----+----- Form 3.5"/HH Cylinders 949| | | Capacity form/unform 320/ MB Heads 15| | | Seek time / track 12.5/ 4.0 ms Sector/track | | | Controller SCSI2 SINGLE-ENDED Precompensation Cache/Buffer 64 KB DUAL-PORTED Landing Zone Data transfer rate 2.000 MB/S int Bytes/Sector 512 4.000 MB/S ext SYNC Recording method RLL 1/7 operating | non-operating -------------+-------------- Supply voltage 5/12 V Temperature *C 10 50 | -40 60 Power: sleep W Humidity % 8 80 | 5 99 standby W Altitude km -0.305 3.048| -0.305 9.144 idle 11.9 W Shock g 5 | 35 seek W Rotation RPM 4318 read/write W Acoustic dBA spin-up W ECC Bit 48 MTBF h 150000 Warranty Month Lift/Lock/Park YES Certificates CSA,FCC,IEC380,IEC435,UL47... ********************************************************************** L A Y O U T ********************************************************************** WESTERN WDSC8320 TECHNICAL REFERENCE MANUAL WD0097S 8/89 VER. 1.0 +-------------------------------------------------------------+ |+-------------------SCSI--------------------------+ +Power--+| ||o o o o o o o o o o o o o o o o o o o o o o o o 1| |1 O O O|| ||o o o o o o o o o o o o o o o o o o o o o o o o o| | || |+-------------------------------------------------+ +-------+| | +---------+ +----+ | |+-+o o o o| | |Vent Hole | || |o o o o o| +----+ | || +---------+ +----+ | ||Option Jumper | |Vent Hole | ||Block +----+ | || | |+Bit 0 +----+ | | | |Vent Hole | | +----+ | +-------------------------------------------------------------+ ********************************************************************** J U M P E R S ********************************************************************** WESTERN WDSC8320 TECHNICAL REFERENCE MANUAL WD0097S 8/89 VER. 1.0 Jumper Setting ============== Option Jumper Block ------------------- The jumper block is used to select the SCSI device ID and to control spindle motor start. All signal option lines can be driven from one ground line but the ground pins should only be used for driving option lines. +------- C3; Bit2 (MSB) C2; Bit1 -------+ | +----- Blank Polarity C1; Bit0 (LSB) -----+ | | | +--- D2; Remote Start ++-+-+-+-++ |o o o o| |o o o o o| ++-+-+-+-++ Ground A1 -----+ | | | +--- B2; Ground Ground A2 -------+ | +----- B1; (Do not use) +------- A3; Ground NOTE If the remote start shunt is not on, the file starts by SCSI command only. SCSI Address Selection ---------------------- +----------+-----------------------+ | ADDRESS | Jumpers | | | Bit 2 | Bit 1 | Bit 0 | +----------+-------+-------+-------+ | 0 | OPEN | OPEN | OPEN | +----------+-------+-------+-------+ | 1 | OPEN | OPEN | CLOSED| +----------+-------+-------+-------+ | 2 | OPEN | CLOSED| OPEN | +----------+-------+-------+-------+ | 3 | OPEN | CLOSED| CLOSED| +----------+-------+-------+-------+ | 4 | CLOSED| OPEN | OPEN | +----------+-------+-------+-------+ | 5 | CLOSED| OPEN | CLOSED| +----------+-------+-------+-------+ | 6 | CLOSED| CLOSED| OPEN | +----------+-------+-------+-------+ | 7 | CLOSED| CLOSED| CLOSED| +----------+-------+-------+-------+ ********************************************************************** I N S T A L L ********************************************************************** WESTERN WDSC8320 TECHNICAL REFERENCE MANUAL WD0097S 8/89 VER. 1.0 Notes on Installation ===================== Mounting -------- The drive can be mounted in the following posistions listed below. - Bottom Side Down - Right Side Down - Left Side Down - Rear Side Down Four mounting holes are provided on the bottom of the drive, and two mounting holes are provided on each side of the drive. The torque applied to the mounting screws is not exceed 0.7 Newton meters. A minimum of 2 mm clearance should be given to the bottom surface except at the bottom mounting holes. For proper cooling it is suggested that a clearance of 6 mm be provided under the drive and on top of the drive. Precaution must be taken so as not to block any of the vent holes on the side of the drive. Electrical Interface Specifications ----------------------------------- The WD-SC8320 disk drive uses single-ended drivers and receivers which will permit cable length of up to 6 meters (19.68 feet). Power Connector --------------- +------------+ pin 1 +12 V | 1 2 3 4 | pin 2 GND +------------+ pin 3 GND pin 4 + 5 V The DC power connector is designed to mate with AMP part 1-480424-0 using AMP pins part 350078-4 (strip) or part 61173-4 (loose piece), or their equivalent. SCSI Signal Connector --------------------- The SCSI signal connector is a 50-pin connector Molex part #70248 meeting ANSI/SCSI specifications. SCSI Bus Terminators -------------------- The disk drive has no internal SCSI bus terminators. The user is responsible for properly terminating and powering the SCSI bus in the using system. AMP #88-4163-081-1 or DATA MATE DM500-06-8 or equivalent external terminator may be used for termination of the drive. For a single-ended cable a 50 conductor flat cable or a 25 signal twisted cable can be used with a maximum length of 6.0 meters, and a stub length not to exceed 0.1 meters. This disk drive has an internal stub length of 0.077 meters. To remain compliant with ANSI, the SCSI bus cable must not add more than 0.023 meters additional stub length. Terminator | +-------------- ---------------xx XX XX| xx XX XX| DRIVE xx --->XX --->XX| CABLE xx XX XX| xx XX XX| xx XX XX| -----------xx XX XX| | Actuator -------- The read/write heads are mounted on the actuator. The actuator is a swing-arm assembly driven by a voice coil motor. A closed-loop positioning servo controls the movement of the actuator. A dedicated servo surface and head supplies feedback to the positioning servo to keep the read/write heads centered over the desired track. During seeks, the servo head provides track crossing information to the servo. The actuator assembly is balanced to allow vertical or horizontal mounting without adjustment. When the unit is stopped (via a SCSI command or power off condition) the actuator automatically moves the heads to a dedicated landing zone outside of the data area, where the actuator is locked. ********************************************************************** F E A T U R E S ********************************************************************** WESTERN WDSC8320 TECHNICAL REFERENCE MANUAL WD0097S 8/89 VER. 1.0 Description/Features -------------------- i.e. - Industry-standard interface: ANSI/SCSI-2 - Thermal compensation - Integrated controller - Logical block addressing - 512 bytes/sector - Implied seeks - SCSI disconnect and reconnect capability - SCSI bus parity - Rotary voice coil motor actuator - Closed-loop actuator servo - 1 : 1 interleave - Buffer memory parity - Read buffer look-ahead - Self-diagnostics on power-up - Automatic retry and data correction on read errors - In-line alternate sector assignment for high performance - Reassignment of new defective sectors without the need to reformat Seek Time --------- +----------------------------------+--------+ | | SC8320 | +----------------------------------+--------+ |Track-to-Track msec. typ. | 4 | +----------------------------------+--------+ |Average msec. typ. | 12.5 | | msec. max. | 25 | +----------------------------------+--------+ |Latency msec. avg. | 6.95 | +----------------------------------+--------+ Data Transfer to/from SCSI Bus ------------------------------ The time required to transfer data between the SCSI bus and the drive's internal data buffer, that is not overlapped with the time for the seek, latency, command execution overhead, or data transfer to/from disk. This time is based on a SCSI synchronous data transfer rate of 4.0 MB/sec. ********************************************************************** G E N E R A L ********************************************************************** WESTERN TIPS WESTERN DIGITAL 3.5-INCH DRIVES FREQUENTLY ASKED QUESTIONS ---------------------------------------------------------- 1) Will a Caviar drive work in my system? If your computer is 100% AT compatible and has either a 40-pin AT IDE interface on the motherboard or an IDE controller card with a 40-pin data cable. 2) What are the master/slave jumper settings on Western Digital drives? All Western Digital drives are configured the same. On the back of the drive between the 4-pin power connector and the 40-pin data connector, there is a jumper block J8 consisting of 6 pins. Western Digital hard drives are shipped with a jumper shunt in the neutral storage position (across pins 5 and 3) for future dual drive use. - If you are installing the Western Digital hard drive as the only hard drive in your system, leave the jmper shunt in the neutral storage posiition. Jumper shunts are not required for single hard drive installations. - To designate the Western Digital hard drive as the master (C:), place a jumper shunt on pins 5-6 - To designate the Western Digital hard drive as the slave (D:), place a jumper shunt on pins 3-4. 3) What are the drive type and the drive parameters in the CMOS, for Western Digital drives? On top of the drive, the number of cylinders, heads and sectors per track are printed on the label. Precomp and L-zone should be set equal to the drive's cylinder count + 1. Select user type or custom type (typically type 41 or 42) for your drive. This will allow you to type in the parameters. Older systems that do not offer a user type can either upgrade the system BIOS or set the drive to drive type 1 (which should be a smaller drive size), and run Ontrack Disk Manager from A drive to get the full capacity of the drive. If you do not follow one of these procedures and your system is pre-1994, you will be limited to the largest size drive your BIOS will allow. 4) What is the Ontrack Disk Manager software that came with my drive and what does it do? Ontrack Disk Manager is the original hard disk installation package that will initialize, partition, and prepare your hard drive for use. Ontrack Disk Manager also allows you to access the full capacity of the drive even when your system BIOS can't. It is compatible with 32-bit disk access. Note: Ontrack Disk Manager must be installed from floppy drive A. If your A drive is a 5.25-inch floppy drive, copy the contents of your Ontrack Disk Manager disk to a formatted 5.25-inch disk and re-run Ontrack Disk Manager. 5) I just installed Ontrack Disk Manager on my Caviar drive and tried to install DOS. DOS attempted to write to my drive and it formatted my drive back to 528 MB which is my BIOS limitation. How do I install DOS and still get the full capacity of my drive? After Ontrack Disk Manager installation, you must create an Ontrack Disk Manager rescue disk. There are two ways of accomplishing this: OPTION 1: - Create a clean DOS bootable disk. - Copy 2 files from the Ontrack Disk Manager disk to your bootable disk: XBIOS.OVL, and DMDRVR.BINs Create a CONFIG.SYS file on this bootable disk with these 3 lines: DEVICE=DMDRVR.BIN FILES=35 BUFFERS=35 - Remove the floppy and reboot the system. - When you see the message "Press spacebar to boot from diskette", press the spacebar (system halts). - Insert the rescue disk in the A: drive. - Press any key (system resumes boot process). - At the A: prompt, remove rescue disk, insert DOS installation disk and type SETUP. - You can now install DOS without overwriting the Ontrack Disk Manager files. OPTION 2: - Create a clean DOS bootable disk. - Insert Ontrack Disk Manager disk in the A: drive. - At the A prompt, type: DMCFIG/D=A:. You will be prompted to insert a bootable floppy in the A: drive. - Follow the prompts on the screen. Ontrack Disk Manager will ask you to change disks a few times. - Continue until Ontrack Disk Manager is finished. - Remove the floppy and reboot the system. - When you see the message "Press spacebar to boot from diskette". Press the spacebar (system halts). - Insert the rescue disk in A drive. - Press any key (system resumes boot process). - At A prompt, remove rescue disk, insert DOS installation disk and type SETUP. - You can now install DOS without overwriting the Ontrack Disk Manager files. 6) CHKDSK or SCANDISK reports a few bad sectors. How do I go about fixing the problem. You can use the Western Digital defect management utility WDATIDE. One of its options is the comprehensive surface analysis. This procedure will mark all grown defects bad if indeed there are any and it will compensate for the lost capacity by utilizing spare tracks. Note: This utility is data destructive. Back up all data on the drive before using it. Due to the thoroughness of this operation, WDATIDE can take quite a bit a time depending on the capacity of your drive. 7) Do I have to do anything with my original drive when adding a new drive to my system? Yes, one hard drive must be designated as the master drive (preferably the newer, faster drive) and the other must be designated as the slave drive. Typically, most drives need to have a jumper placed on them to specify the Master or Slave position. For information on non-Caviar hard drives, please contact the appropriate manufacturer. 8) I installed my new drive and entered the drive parameters in the CMOS, but the drive will not boot or it displays the message "HDD controller failure." Your drive must be partitioned and formatted before it will be bootable. If your system will support drives larger than 528 MB, and you have a copy of MS-DOS or PC-DOS version 5.0 or greater, insert the setup diskette in your floppy drive and turn on your computer. Follow the prompts and DOS will partition and format the drive for you. If you do not have a copy of MS-DOS or PC-DOS version 5.0 or greater, you will need to boot from a bootable disk and then run the FDISK command to partition your drive, and then format the drive using the DOS FORMAT command. After running format, you should be able to reboot your computer from your hard drive. 9) How can I use the full capacity of my Caviar drive of 540 MB or greater? You can use Ontrack Disk Manager to obtain full capacity if your system does not support LBA mode. If your system does support LBA mode, you can enable LBA in your CMOS setup utility. 10) How can I get 32-Bit Disk Access in Windows on my Caviar AC2540, AC2700 or AC31000 in Windows 3.1x? If your BIOS supports the drive at full capacity (i.e., the BIOS supports Logical Block Addressing) you use WDCDRV.386, Western Digital's FastDisk device driver. This driver is contained in a file named WIN31.EXE available for downloading from our bulletin board (714/753-1234), our Web server (WWW.WDC.COM), our FTP site (FTP.WDC.COM), our forum on the Microsoft Network (Go word WDC), and our forum on America On-line (keyword WDC). If your BIOS does not support LBA mode and you have installed your drive using Ontrack Disk Manager (v6.03 and above), run DMCFIG to install WDCDRV.386 and obtain 32-Bit Disk Access. 11) My drive will not spin up or spins down after a few seconds. This is a drive failure. Return the drive to the distributor or contact a technical support representative to receive a Return Materials Authorization (RMA). 12) CMOS, FDISK and File Manager in Windows report less than the capacity of my new drive, but CHKDSK reports the right number of bytes. Which is correct? Setup (CMOS) and FDISK use a binary definition of a megabyte which is calculated at 1,048,256 bytes per megabyte. All hard drive manufacturers and the DOS CHKDSK utility use a decimal definition of a megabyte which is calculated at 1,000,000 bytes per megabyte. This is why some utilities show 515 MB for a 540 megabyte drive and some show the actual number. 13) How Can I install OS/2 for Windows, OS/2 3.0 WARP, Windows NT 3.5x or Windows 95 on my drive which was initially installed using Ontrack Disk Manager? If you have Ontrack Disk Manager version 6.03, 6.03a, or 6.03b, download the file named DMPATCH.EXE from Western Digital's online services: ftp site: ftp.wdc.com World Wide Web Site: http://www.wdc.com/ Microsoft Network (MSN) - Go word WDC America Online (AOL) - Keyword: Western Digital Western Digital's BBS at (714) 753-1234 This file has the latest Ontrack Disk Manager drivers which will allow you to install OS/2 version 2.1x, OS/2 WARP, Windows NT 3.5x or Windows 95 on your hard drive. Please read the included readme file with this file for further detail. 14) My drive will work as a slave but not as a master (or vice- versa). Check master/slave jumpers on all drives. Also, some drive's speed and timing differ drastically as to the initial spinup sequence. This might confuse the system and cause one of the drives not to be recognized. The best solution for this situation is to exchange drives (make the master a slave and vice-versa). 15) My drive will not partition when I run FDISK. It hangs the system or it displays the message: "Runtime error." This is usually caused by corruption or damage to track zero. Use the Western Digital utility WDFMT to format the drive. If that does not help, call Western Digital Technical support at 1-800-ASK-4-WDC to get further instructions. 16) Can a hard drive be mounted on it's side, edge, or upside down? Drives can be mounted on any side but it is preferable to mount the drive right side up. It is also important to use all four screws to hold the drive firmly in place. Self-Monitoring, Analysis, and Reporting Technology (S.M.A.R.T.) ---------------------------------------------------------------- S.M.A.R.T. enables a drive's internal status to be monitored through diagnostic commands at the host level. The Caviar AC21600, AC32100 and AC32500 drives monitor read error rate, start/stop count, spin-up retry count, and drive calibration retry count. All of these attributes are updated and stored on the hard drive in the reserved area of the disk. The hard drive also stores a set of attribute thresholds that correspond to the calculated attribute values. Each attribute threshold indicates the point at which its corresponding attribute value achieves a negative reliability status. ==================================================================== QUESTION Which hard drive specification is most important to overall system performance ? - Host Transfer Rate - Drive RPM (revolutions per minute) - Disk Transfer Rate (Media Rate) - Seek Time - Cache Size - PC Data Handling - All of the above Answer The correct answer is actually a combination of "all of the above," keeping in mind most of the above specifications are interrelated when it comes to optimizing system performance. The pie chart illustrates the relative influence of factors affecting drive performance during a typical random I/O operation (reading and writing to a hard drive). The major determinate of hard drive performance is mechanical factors which are one hundred times slower than the high-speed electronics contained in a drive. Factors Affecting Hard Drive Performance (In their relative order of importance) MECHANICAL LATENCIES Mechanical Latencies include both Seek Time and Rotational Latency. The seek time is a measure (in milliseconds) of how fast the hard drive can move its read/write heads to a desired location. Rotational latency is a measure of the average time (also in milliseconds) the read/write heads must wait for the target sector on the disk to pass under them once the read/write heads are moved to the desired target track. Mechanical latencies are the main hindrance to higher performance in modern Enhanced IDE (EIDE) hard drives. The time delays of mechanical latencies are one hundred times higher than electronic (non-mechanical) latencies associated with the transferring of data. Therefore, reducing mechanical latencies (a lowering of seek time and rotational latency) should be the top consideration in improving hard drive performance. RPM This is the rotational speed of the media (disk), also referred to as the spindle speed. Hard drives only spin at one constant speed. Typical speeds are 3600 to 3880, 4500, and 5200 to 5400 revolutions per minute. The slower the RPM, the higher the Mechanical Latencies. Disk RPM is a critical component of hard drive performance because it directly impacts the rotational latency and the Disk Transfer Rate explained below. DISK TRANSFER RATE The Disk Transfer Rate (sometimes called media rate) is the speed at which data is transferred to and from the disk media (actual disk platter) and is a function of the recording frequency. Typical units are bits per second (BPS), or bytes per second. Modern hard disks have an increasing range of Disk Transfer Rates from the inner diameter to the outer diameter of the disk. This is called a "zoned" recording technique. The key media recording parameters relating to density per platter are Tracks Per Inch (TPI) and Bits Per Inch (BPI). A track is a circular ring around the disk. TPI is the number of these tracks that can fit in a given area (inch). BPI defines how many bits can be written onto one inch of a track on a disk surface. To greatly simplify, the Disk Transfer Rate (the rate at which data is read and written to the disk) is dependent upon the speed of the disk (RPM) and the density of the data on the disk (BPI). Even most modern, high-speed, 5000 RPM hard drives are generally limited to a maximum Disk Transfer Rate of approximately 9 to 10 MB per second. This specification is critical to performance and must be weighed carefully against such electronic latencies as Mode 3 PIO and Mode 4 PIO host transfer rates explained below. PC DATA HANDLING After the data moves down the IDE cable from the drive to the host interface, there are several factors that can affect drive performance over which the hard drive has no control. PC Data Handling is independent from the hard drive and very dependent upon the CPU type and speed, the BIOS overhead (how the system issues commands to the hard drive), speed and size of the system RAM and RAM cache, CPU-to-memory speed, and storage subsystem performance. PC Data Handling is also affected by the caching methods of such software applications as SMARTDRIVE, 32-bit disk access operating system drivers, etc. HOST TRANSFER RATE The speed at which the host computer can transfer data across the IDE or EIDE interface. Processor Input/Output (PIO) modes and Direct Memory Access (DMA) modes are defined in the ATA-2 industry specification as follows: Mode 3 PIO 11.1 MB/sec Mode 4 PIO 16.6 MB/sec Mode 1 DMA 13.3 MB/sec Mode 2 DMA 16.6 MB/sec Modern host computer systems usually support most of the above modes. Faster Host Transfer Rates in the future will use multi-word DMA modes as the industry will not support any future PIO mode standards beyond mode 4. The computer system manufacturer is responsible for implementing a Host Transfer Rate that is high enough to ensure that the host computer is not the performance bottleneck. Implementing increasingly higher Host Transfer Rates without corresponding increases in Disk Transfer Rates on the hard drive will not result in increased drive performance. Cache Buffer Size - Is Bigger Always Better ? A Cache Buffer is similar to a water glass. When you are writing to a hard drive, the host computer fills the glass and the disk media empties it. If you are reading data from a hard drive, the disk media fills the glass and the host computer empties it. The reason that a bigger cache buffer is not always better (or faster) is because the host computer (with Mode 4 PIO or Mode 2 DMA capabilities) can empty or fill the glass much faster than the hard drive can empty or fill it. When the host system can transfer data in or out of the cache buffer faster than the media rate, a larger buffer size becomes irrelevant because the host system is always "waiting" for the hard drive. Western Digital hard drives are designed with cache buffer sizes that are matched to the Disk Transfer Rate capabilities of the drive and the Host Transfer Rates of modern computer systems. All of our drives are benchmarked with various cache buffer sizes to verify that the most cost-effective and performance-effective cache size is implemented. Confusion Over Mode 4 and Mode 2 DMA The Enhanced IDE program created the long-range road map for performance enhancements which included faster disk and host transfers, Mode 3, Mode 4, Mode 2 DMA, etc. Currently, computer systems and hard drive controller silicon have most of the elements needed to implement Mode 4 PIO or Mode 2 DMA (a 16.6 MB/sec Host Transfer Rate). However, to take advantage of these performance modes, physical drive architecture must also make some performance improvements in the area of Mechanical Latencies and Disk Transfer Rate (media rate) as defined earlier. Some competitors, in their eagerness to supply a new feature, are prematurely marketing Mode 4 and Mode 2 DMA. While their drive controller silicon supports these modes (which is very easy and inexpensive to implement), spindle speeds (RPM), rotational latency, bit density, and other factors have not yet been improved (these being very difficult and costly). The result is hard drives which have the electronic capability to do Mode 4 and Mode 2 DMA transfer rates, but can't take advantage of these modes due to the slower Disk Transfer Rate of the drive. Western Digital will not be implementing Mode 4 or Mode 2 DMA on older drive products as the host systems into which these drives are designed are not electrically capable of these data transfers, nor are the Disk Transfer Rates on these drives beyond current Mode 3 capabilities. As next generation systems are introduced, they will be paired with next generation drives. Those drives will require and offer true Mode 4 / Mode 2 DMA capability from a total drive architecture standpoint. ===================================================================== AC2540/2635/2700/2850/21000/31000/31200/31600 Windows 95 Operating System Addendum ------------------------------------ The information in this addendum supersedes that supplied in Windows 95 section on pages 35 and 36 of this manual. Please refer to thos addendum for Windows 95 questions. Although Windows 95 is capable of recognizing the full capacity of hard drives larger than 528 MB in systems with a translating BIOS, some restrictions apply to systems without a translating BIOS. For Systems With a Translating BIOS ----------------------------------- Enter your CMOS setup and select a drive type that will recognize the full capacity of your drive. This is usually done by selecting the auto config drive tape. The boot partition can be set up to be as large as the full capacity of your hard drive. For Systems Without a Translating BIOS -------------------------------------- Enter your CMOS setup and select a user defined drive type. Enter these parameters: cylinders = 1024, heads = 16, sectors = 63. Your system's total disk space will be limited to a maximum of 528MB. If you want your system to utilize more than 528 MB of disk space, you must use Ontrack's Disk Manager software (or a similar third- party installation software). Installing Windows 95 on a Hard Drive with Ontrack Disk Manager Already Installed --------------------------------------------------------------- The Windows 95 installation program will analyze your computer system and install seamlessly with Ontrack Disk Manager. Computer Systems with Windows 95 Already Installed -------------------------------------------------- If you are installing a Western Digital hard drive and Ontrack Disk Manager on a computer system with Windows 95 already installed, you must install Ontrack Disk Manager as described here. Enter your CMOS setup and select a user defined drive type. Enter these parameters for drives with capacities over 528MB: Cylinders = 1024, Heads = 16, Sectors = 63. Save these changes and reboot your computer. 1. Select the Start icon from the Windows 95 main screen. DO NOT open an MS-DOS menu from Win 95 to install Ontrack Disk Manager. 2. Choose the Shut Down option. 3. Select Resatrt Computer in DOS mode. When your computer restarts, you should be at the DOS prompt. 4. Install Ontrack Disk Manager. Windows 95 will noe recognize the full capacity of your hard drive and run in 32-bit disk access mode for optimum performance.