Feature Descriptions

￿￿￿￿￿￿2QYGTThe￿disk1P￿drive5GNH￿performs6GUV￿￿2156a self-diagnostic￿test immediately at power up. Both the Fault LED and a Busy LED briefly illuminate during spin-up as a lamp test.

If the drive passes the self-tests (and the spin-up jumper is installed), it spins up and performs further diagnostics on the Head Disk Assembly (HDA). The drive indicates “not ready” until the HDA tests are completed successfully.

The drive diagnostics test the following:

RAM and ROM chips

Buffer memory

Gate array chips

Read/write encoding circuits

Basic servo functions

After a SELECTION TIME following power-on, the disk drive is able to respond with appropriate status and sense data to the TEST UNIT READY, INQUIRY, and REQUEST SENSE commands.

￿￿￿￿￿￿2GTKQFKEDuring￿5GNHnormal￿#FLWUVOGPVUdrive operation, certain periodic functions occur automatically so the drive can verify and maintain the integrity of its operations and optimize performance. The operations performed include those listed below.

Move/Switch idle heads

Adaptive seek profile calibration

ROM checksum

Such periodic functions can make the drive appear to be active when no commands are outstanding, because the drive appears to be seeking. Periodic calibrations occur only after the drive has been inactive for 30 seconds.

Note: If a media access command is received during a calibration, the drive aborts the calibration process and acts on the command.

If desired, calibrations can be suspended to reduce drive overhead by setting the Manual Calibration bit in the (Vendor) Special Function Control page. If this is done, manual calibrations can still be initiated by performing a REZERO UNIT command.

￿￿￿￿￿￿*QUVThe￿&KCIPQUVKEUHost Processor can command the drive to perform diagnostic tests and report status using RECEIVE and SEND DIAGNOSTIC RESULTS commands. Certain parameters can be sent to the drive to alter or enhance the performance of the diagnostic tests specified.

Maxtor Atlas 10K III 6-7

Page 249
Image 249
Maxtor 10K III manual Feature Descriptions