IDE-Bus Interface Connector (J41C) ---------------------------------- On the ProDrive ELS 42/85/127/170AT hard disk drive, the IDE-bus interface cable connector (J41 section C) is a 40-pin Universal Header.

Mounting -------- Drive mounting orientation, clearance, and ventilation requirements are described in the following subsections. For mounting, #6-32 UNC screws are recommended. To avoid stripping the mounting-hole threads, the maximum torque applied to the screws must not exceed 8 inch- pounds.

CS Cable Select Jumper ----------------------- When two ProDrive ELS 42/85/127/170AT hard disk drives are daisy- chained together, they can be configured as Master and Slave by using the CS jumper or by using the DS jumper - BUT NOT BOTH. To configure the two drives using the CS jumper, set the CS jumper to CLOSED and the DS jumper to OPEN on each drive.

SP Slave Present Jumper ------------------------ The SP jumper normally is not needed. However, when the ProDrive ELS 42/85/127/170AT is configured as Master and is connected to a Slave drive that does not implement the Drive Active/Slave Present (DASP-) signal, it is necessary to set the SP jumper to CLOSED on the ProDrive ELS 42/85/127/170AT.

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DC Motor Assembly ----------------- Integral with the base casting, the DC motor assembly is a rotating- shaft, brushless DC spindle motor that drives the counter-clockwise rotation of the disks.

When errors occur, an automatic retry and a more rigorous double- burst correction algorithm enable the correction of any sector with two burst of three incorrect bytes each or up to six multiple random one-byte burst errors. In addition to these advanced error correction capabilities, the drive's additional cross-checking code and algorithm double checks the main ECC correction to greatly reduce the probability of miscorrection.

Data Transfer Rates ------------------- Data is transferred from the disk to the read buffer at a rate up to 2.5MB/s in burst. Data is transferred from the read buffer to the AT bus at a rate up to 4.0 MB/s, using programmed I/O.

Error Detection and Correction ------------------------------ As disk drive areal densities increase, obtaining extremely low error rate requires a new generation of soghisticated error-correction codes. Quantum ProDrive ELS 42/85/127/170AT series hard disk drives implement 112-bit single- and double-burst Reed-Solomon error correction techniques to reduce the uncorrectable read error rate to less than one bit in 1 x 10(14) bits read.

AT Interface Controller ----------------------- The AT Interface Controller portion of the DCAIA provides data handling, bus control, and transfer management services for the IDE interface. It is capable of data transfer rates of up to 4 MB/s. Configuration and control of the interface is accomplished by the Controller across the MAD bus. Data transfer operations are controlled by the DCAIA Buffer Controller module.

Orientation ----------- The mounting holes on the ProDrive ELS 42/85/127/170AT hard disk drive allow the drive to be mounted in any orientation.

J41A/B/C DC Power/Interface Connector -------------------------------------- The drive's DC power can be applied to either section A or B. The IDE-bus interface (40-pin) uses section C.

Pin 28 is grounded - that is, set to OPEN - on the cable coming from the host. This configures the first drive as Master. Then, pin 28 on the connector at the second drive should be made an open circuit by a cut in signal line 28 in the cable from the first drive, so it becomes high - that is, set to CLOSED - due to a pull-up in the second drive. This configures the second drive as a Slave.

The Quantum MTBF numbers represent Bell-Core MTBF predictions at ambient operating conditions and represent the minimum MTBF that Quantum or a customer would expect from the drive. Quantum's ongoing reliability testing and field return data has historically confirmed an actual MTBF of twice the Bell-Core prediction.

Formatted Capacity ------------------ At the factory, the ProDrive ELS 42/85/127/170AT receives a low-level format that creates the actual tracks and sectors on the drive.

Disk Caching ------------ The ProDrive ELS 42/85/127/170AT hard disk drive incorporates DisCache, a 32K (8K for the 42AT) disk cache, to enhance drive performance. This integrated feature can significantly improve system throughput. Read and write caching can be enabled or disabled using the SET CONFIGURATION command.

DS Drive Select Jumper ----------------------- You can configure two drives on the ATA Interface as Master (Drive 0) and Slave (Drive 1) using the DS jumpers. Set the CS jumpers to OPEN for each drive. Then, set the DS Jumper to CLOSED on one drive to configure that drive as Master. Set the DS jumper to OPEN on the other drive to configure as Slave.

System Startup and Operation ---------------------------- Once you have installed the ProDrive ELS 42/85/127/170AT hard disk drive and adapter board (if required) in the host system, you are ready to partition and format the drive for operation. To set up the drive correctly, follow these steps:

Ventilation ----------- The ProDrive ELS 42/85/127/170AT hard disk drives operates without a cooling fan, provided the ambient air temperature does not exceed 122*F (50*C).

To prevent the possibility of incorrect installation, make sure the connector is keyed by removing Pin 20. Removing this pin ensures the connector cannot be installed upside down.

Drive Installation ------------------ You can install the ProDrive ELS 42/85/127/170AT hard disk drive in an AT-compatible system in two ways:

Clearance --------- The printed-circuit board assembly (PCBA) is very close to the mounting holes. Clearance from the drive to any other surface - except mounting surfaces - must be 3.5 millimeters (0.14 inches) minimum. The specified screw length allows full use of the mounting- hole threads, while avoiding damaging or placing unwanted stress on the PCBA.

Once you install the CS jumper, the drive is configured as a Master or Slave by state of the Cable Select signal, which is pin 28 at the IDE-bus interface connector. Quantum uses pin 28 as a vendor-specific pin; it does NOT conform to the function normally allocated for this pin according to the ATA (AT Attachment).