Test Unit Ready Command - Seagate STT20000A Product Manual

ATAPI Interface

Test Unit Ready command

Bit 7
Byte
0
1
2
3
4
5
STT20000A Product Manual
6 5
This command can be used to determine the readiness of the device to accept a
media access command. It's purpose is to indicate the cartridge state: no cartridge
(or drive fault), cartridge becoming ready, or cartridge/drive ready.
If the drive is busy with a previous command (DSC reset), the drive will wait for the
previous operation to complete before releasing the ATA bus. On some other ATAPI
tape drives, Test Unit Ready does not wait for DSC set before completing, and if an
application needs to "wait" for an command done via the ATAPI interface, Read
Position should be used instead.
4 3
Operation code (00h)
Reserved
Reserved
Reserved
Reserved
Reserved
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