S T 2 5 1 R - 0 SEAGATE NO MORE PRODUCED Native| Translation ------+-----+-----+----- Form 5.25"/HH Cylinders 820| | | Capacity form/unform 62/ MB Heads 6| | | Seek time / track 40.0/ ms Sector/track 26| | | Controller RLL / ST412 Precompensation 65535 Cache/Buffer KB Landing Zone 819 Data transfer rate 0.938 MB/S int Bytes/Sector 512 0.938 MB/S ext Recording method RLL operating | non-operating -------------+-------------- Supply voltage Temperature *C | Power: sleep W Humidity % | standby W Altitude km | idle W Shock g | seek W Rotation RPM 3600 read/write W Acoustic dBA spin-up W ECC Bit MTBF h 70000 Warranty Month 12 Lift/Lock/Park YES Certificates ********************************************************************** J U M P E R S ********************************************************************** SEAGATE ST213/ST225/ST225R/ST238R/ST250R PRODUCT MANUAL 36025-003 Jumper setting -------------- x = Factory setting JP7 Drive select Configuration Jumper block ---------------------------------------------- +-------------+------+------+------+------+ |Drive Select | 9-10 |11-12 |13-14 |15-16 | +-------------+------+------+------+------+ |Drive 4 |CLOSED|OPEN |OPEN |OPEN | |Drive 3 |OPEN |CLOSED|OPEN |OPEN | |Drive 2 |OPEN |OPEN |CLOSED|OPEN | |Drive 1 |OPEN |OPEN |OPEN |CLOSED| +-------------+------+------+------+------+ The Drive Select line enables the controller to select and adress the drive. Control cable interface options may use either a daisy- chain or radial configuration. JP7 Manufacturing test ----------------------- x 7- 8 OPEN Do not install a jumper on the Manufacturing Test jumper on the user configuration jumper block. This is a test function and used during the manu- facturing process ans is not recommended for field use. When the pins are shorted, the stepper motor will continuously seek between Track 0 and the maximum cylinder and will ignore control signals via the interface. JP7 Write Fault ---------------- x 5- 6 OPEN The Write Fault signal may be internally latched. It may be enabled by shorting pins 5-6 at J7. This latch may be cleared when Drive Select goes false (if selected). The standard configuration, with the shorting block removed, causes Write Fault to go false when Write Gate goes false. Not required for standard operation. JP7 Recovery Mode ----------------- x 3- 4 CLOSE Recovery Mode is a read/write head microstepping option on the ST225R and ST250R. It is enabled by shorting pins 3-4 at J7. THE ST225R AND ST250R ARE SHIPPED WITH THIS OPTION ENABLED. Recovery Mode is initiated when the controller asserts the Recovery Mode line true at the interface. This changes the step line to a microstep function after 100 nsec. A step pulse will now cause Seek Complete to go false 100 nsec. after the drive receives the pulse. The drive then microsteps off-track using the optimum algorithm, allowing time for the read/write heads to settle and then takes the Seek Complete line true. The controller may then read data. If data is not read correctly, the controller may issue an additional step pulse. Up to 2 microstep algorithms may be accessed before the sequence is repeated. When data is read correctly, the controller exits Recovery Mode by taking the Recovery Mode line false at the interface. The drive will then return the heads to the nominal position by taking Seek Complete false, allowing time for the heads to settle, and resasserting Seek Complete. JP7 Radial/Daisy-Chain Mode ---------------------------- x 1- 2 OPEN Daisy-Chain-Configuration A Daisy-Chain configuration allows connection of a maximum of two drives on a common control cable. A separate data cable is required for each drive. The last drive in the chain (physically farthest from the controller) requires termination. All other drives should not be terminated. The maxi- mum permitted cable length from the controller to the last drive is 10ft (0.31m). 1- 2 CLOSE Radial Configuration To configure the drive radially, install a jumper on pins 1 and 2 of the user configuration jumper block. If you configure the drive radially, leave the resistor terminator packs installed on all drives. Each radially connected drive has its own control and data cable. Drives in this configu- ration always remain selected. J3 DC Power and pin connector assignments ------------------------------------------ +------------+ pin 1 +12 VDC | 1 2 3 4 | pin 2 +12 VDC Gnd +------------+ pin 3 + 5 VDC Gnd pin 4 + 5 VDC