Agilent Technologies 1670G Series Service Manual page 210

Theory of Operation
System Tests (SysPV)
sectors. If no bad sectors are found a test file will be created on the disk and test data will be
written to the file. The file is then read and the test data compared with known values. The
test file is then erased at the conclusion of the test.
For the hard disk drive, the disk test exercises the disk controller that is on the hard disk
drive assembly. In addition, the buffers that make up the hard disk drive interface are tested.
When the test is executed, the sectors of the hard disk are checked, and then write/read
tested like the flexible disk drive.
Passing the disk test implies that the flexible disk controller circuitry in the logic analyzer and
the disk read/write circuitry in the flexible disk drive are functioning properly. The flexible
disk drive can read and write to a LIF- or DOS-formatted disk, and the data will not be
corrupted by the flexible disk drive circuitry. Passing the disk test also implies that the hard
disk drive controller circuitry, interface, and read/write circuitry are functioning properly, and
that the data will not be corrupted by the hard disk drive circuitry.
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