S T 3 7 8 0 A M E D A L I S T 7 2 0 SEAGATE NO MORE PRODUCED Native| Translation ------+-----+-----+----- Form 3.5"/SLIMLINE Cylinders | 1399| | Capacity form/unform 722/ MB Heads 4| 16| | Seek time / track 12.0/ 3.5 ms Sector/track | 63| | Controller IDE / ATA2 FAST/ENHA Precompensation Cache/Buffer 256 KB SEGMENTED Landing Zone Data transfer rate 4.500 MB/S int Bytes/Sector 512 16.600 MB/S ext PIO4 Recording method RLL 1/7 operating | non-operating -------------+-------------- Supply voltage 5/12 V Temperature *C 5 55 | -40 70 Power: sleep W Humidity % 8 80 | 5 95 standby 1.0 W Altitude km -0.305 3.048| -0.305 12.192 idle 2.8 W Shock g 10 | 75 seek 6.6 W Rotation RPM 4500 read/write 4.5 W Acoustic dBA 33 spin-up 7.0 W ECC Bit - MTBF h 300000 Warranty Month Lift/Lock/Park YES Certificates CSA,FCC,UL1950,UL478,VDE ********************************************************************** L A Y O U T ********************************************************************** SEAGATE ST3780A/ST31220A PRODUCT MANUAL 36260-001 DRAFT 10, 6/94 +---------------------------------------------------------++-+ | |+-+J5 | | | |XX | |XX I | |XX N | |XX T | |XX E J1 | |XX R | |XX F +--J8 |XX A | | |XX C | | |XX E | | |XX +--1 | 1 | |XX J3 | +--J6 |XX +-------------------------------------------------+--+----+ ********************************************************************** J U M P E R S ********************************************************************** SEAGATE ST3780A/ST31220A PRODUCT MANUAL 36260-001, DRAFT 10, 6/94 Jumper Setting ============== Jumpers ------- You can connect two drives to a daisy-chain cable if both drives meet the same interface specifications. In a dual-drive configuration, one drive is designated as the master (drive 0) and the other as the slave (drive 1). If you intend to use the cable select option in a dual-drive system, before continuing you should determine whether your system supports it. See your computer documentation for details. Jumper sizes ------------ The jumper blocks use 0.1-inch configuration jumpers. Use Seagate part number 10562-001 or an equivalent. The drive is shipped with spare jumpers which may be used on any jumper block. CAUTION If you try to install a jumper that is not the correct size, you could damage the jumper and the jumper block pins. J5 Master/Slave jumper block ----------------------------- --+---+--Circuit board |o 1| |o o| No jumper = One drive only +---+ --+---+--Circuit board |xxx| |o o| Spare - as shipped +---+ --+---+--Circuit board |o X| |o X| Drive is slave +---+ --+---+--Circuit board |X 1| |X o| Drive is master with slave present +---+ --+---+--Circuit board |X X| |X X| Cable select. You must also install a jumper on pins 6 +---+ and 8 of J8. Your drive is shipped with a jumper in a spare location on pins 1 and 3 of the master/slave jumper block. If you are installing only one drive, you can leave the jumper installed on pins 1 and 3, or you can remove all jumpers from the jumper block. You can install up to two drives in a standard AT system. If you are installing two drives in your system, configure one drive as the master and the other as the slave according to the following guide- lines: - To configure the drive as a master with a slave present, install a jumper on pins 3 and 4 only of the master/slave jumper block of the master drive. NOTE If both the master and the slave are ST31220 family drives, you do not need to install a jumper on pins 3 and 4. This is because the master can detect the presence of the slave using the DASP- signal on the AT interface cable. If the drives in your application do not implement the DASP- signal, install the jumper on pins 2 and 4 of the master/slave jumper block on the master drive only. - To configure the drive as a slave, install a jumper on pins 1 and 2 only of the master/slave jumper block on the slave drive. With the aid of a special interface ribbon cable, the cable select option allows you to determine the master and slave according to where the drives are plugged into the cable. J6 Dual-drive emulation jumper block ------------------------------------- --+--1+--Circuit board |xxx| |o o| Spare - as shipped +---+ --+--1+--Circuit board |X X| |X X| Dual-drive emulation mode +---+ With jumpers installed on pins 1 and 2, and pins 3 and 4 of jumper block J6 you can install this drive as both C and D drives simultaneously. Under dual-drive emulation, capacities are as follows: for the ST31220A, each subdrive has a capacity of 528 MB for a total of 720 MB. Installation in this manner causes the drive to appear to your system as two drives, master and slave, so an additional slave drive cannot be added. NOTE When the drive is configured with dual-drive emulation, both emulated drives respond as one to any power-management command. J8 Options jumper block ------------------------ --+-------------1-+--Circuit board | o o o o o X | | o o o o o o X | Spare - as shipped +14-------------+ --+-------------1-+--Circuit board | o o o o o o | | o o o xxx o o | Cable select +14-------------+ --+-------------1-+--Circuit board | X o o o o o | | X o o o o o o | Remote LED connection pin 13(-), pin 14(+) +14-------------+ Remote LED connection To add an optional remote LED, attach a two-pin, 0.1-inch connector to pins 13 (-) and 14 (+) of the options jumper block J8. All other pins are reserved, don't use them. Cable select option ------------------- If your computer and both of ypur drives support cable select, you can use the cable select option to determine the master and slave. To configure your drives using cable select, you need to install jumpers and use a special cable-select cable as follows: - Install jumpers on pins 1 and 2 and pins 3 and 4 of the master/ slave jumper block J5 and on pins 6 and 8 of the options jumper block J8. - You must use an interface ribbon cable built to support master and slave selection. The cable and its connectors must connect the CSEL signal line to pin 28 of the master drive, but not to the slave drive. That is, the drive that is plugged into the I/O connector connecting the CSEL signal line to pin 28 is the master. The drive plugged into the I/O connector, whose pin 28 is open, is the slave. Pin 28 of its cable connector is not connected to the CSEL line. ********************************************************************** I N S T A L L ********************************************************************** SEAGATE ST3780A/ST31220A PRODUCT MANUAL 36260-001, DRAFT 10, 6/94 Notes on Installation ===================== Mounting the drive ------------------ You can mount the drive in any orientation. NOTE If you format the drive before mounting in the computer, it is best to format it in the same physical orientation it will have when it is mounted. Use the set of mounting guidelines below taht are appropriate to the type of mounting holes used: either bottom mounting holes or side mounting holes. Mounting with the optional 1-inch faceplate adds 0.180 inches 0.010 inches (4.572 mm 0.254 mm) to the overall drive length. Bottom mounting holes Insert four 6-32 UNC screws in the four bottom mounting holes. CAUTION Do not insert the bottom mounting screws more that 0.20 inches (6 turns) into the drive frame. If you use a screw that is too long, you risk damaging the drive's circuit board. Side mounting holes Use four 6-32 UNC screws in four of the six available side mounting holes. Use two mounting holes on each side of the drive. CAUTION Do not insert the side mounting screws more than 0.20 inches (6 turns) into the drive frame. If you use a screw that is too long, you risk damaging the drive's circuit board. I/O cable and connector ----------------------- The I/O connector is a 40-pin connector. The even pins are next to the edge of the printed circuit board; the odd pins are away from the printed circuit board. Pin 1 is near the 4-pin power connector. There is no pin 20 because that location is used as a key. Make sure the corresponding pin hole on the cable connector is plugged to prevent the connector from being installed upside down. The I/O cable cannot be longer than 18 inches (0.46 meters). The table below lists recommended parts for the mating connector. You can use equivalent parts. Part |Description |3M part number -----------+----------------+-------------- Connector |40-pin |3M-3417-7000 Connector |40-pin |3M-3448-2040 Flat cable |AWG28 (stranded)|3M-3365-40 ********************************************************************** F E A T U R E S ********************************************************************** SEAGATE ST3780A/ST31220A PRODUCT MANUAL 36260-001, DRAFT 10, 6/94 Formatted capacity ------------------ The drive was low-level formatted at the factory. You cannot low- level format it. The drive was configured in translation mode at the factory. You can verify the number of cylinders, sectors per track and heads, and the total number of sectors by using the Identify Drive (ECh) command. The amount disc space which your system will access depends on the type of system that you have and on the type of operating system or third-party installation software that is used to high-level format ST31220 family drives. One of two addressing schemes may be used by your computer to access a hard disc - logical block addressing (LBA) or cylinder-head-sector addressing (CHS). LBA allows you to access the full capacity of your hard disc. CHS, which is used on older DOS systems, will limit the capacity of your hard disc to 1,024 cylinders (approximately 512 MB) unless: - You are using third-party installation software which supports more than 1,024 cylinders - You have installed the dual-drive emulation option - You have a host adapter (controller card) which supports more than 1,024 cylinders. The following equation holds: (sectors) x (heads) x (cylinders) total sectors per drive Multisegmented cache buffer --------------------------- The drive uses the 256-Kbyte multisegmented cache buffer to improve performance by eliminating access times under certain conditions. Read look-ahead The drive uses the read segments to store additional logical sectors, after the last requested sector, into a buffer before the additional sectors are requested by the computer. The cache buffer stores data from the start of a read until the buffer segment is full or until another command is received. Write immediate The drive uses the write segment to store write commands and data. After the drive receives all of the data for the command, it issues a write complete. Then, the drive writes the data to the disc. Write merging The drive accepts contiguous write commands and executes them as one command. PIO and DMA Data Transfer Modes ------------------------------- You can use the Set Features command to set the type of data transfer mechanism and transfer mode used by the drive. To do this: 1. Write Set Features command value 03H (Set Data Transfer mode) to the Features register. 2. Write a transfer types value to the Sector Count register. The upper 5 bits of this value define the type of data transfer, and the low order 3 bits encode the mode value. The following table identifies allowable transfer types values: +----------------------------------------+-----------------------+ |Data transfer mechanism | Transfer types value | +-----------------------------+----------+----------+------------+ |Mechanism name |Mode value|Data Upper|Lower 3 bits| | | |5 bits | | +-----------------------------+----------+----------+------------+ |PIO Transfer Mode (default: | 2 | 00000 | 000 | |Set PIO Mode 2 | | | | +-----------------------------+----------+----------+------------+ |PIO Transfer Mode: Set PIO | 2 | 00000 | 001 | |Mode 2 | | | | +-----------------------------+----------+----------+------------+ |PIO Flow Control Transfer | 0 | 00001 | 000 | |Mode: Set PIO Mode = 0 | | | | +-----------------------------+----------+----------+------------+ |PIO Flow Control Transfer | 1 | 00001 | 001 | |Mode: Set PIO Mode = 1 | | | | +-----------------------------+----------+----------+------------+ |PIO Flow Control Transfer | 2 | 00001 | 010 | |Mode: Set PIO Mode = 2 | | | | +-----------------------------+----------+----------+------------+ |PIO Flow Control Transfer | 3 | 00001 | 011 | |Mode: Set PIO Mode = 3 | | | | +-----------------------------+----------+----------+------------+ |PIO Flow Control Transfer | 4 | 00001 | 100 | |Mode: Set PIO Mode = 4 | | | | +-----------------------------+----------+----------+------------+ |Multiword DMA Mode | 0 | 00100 | 000 | +-----------------------------+----------+----------+------------+ |Multiword DMA Mode | 1 | 00100 | 001 | +-----------------------------+----------+----------+------------+ |Multiword DMA Mode | 2 | 00100 | 010 | +-----------------------------+----------+----------+------------+ |RESERVED | | 01000 | nnn | +-----------------------------+----------+----------+------------+ If the drive does not support a commanded mode, the drive returns an Aborted Command error.