Seagate Technology 10002475-003, Product Description Manual

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Chapter 5 ATAPI Interface
Page 36 STT8000 ATAPI Minicartridge Drive
present Error information. If you do not program this register correctly, the
drive "hangs" in the BSY state. To correct this problem, reset operations.
Supported ATA Commands
The ATA commands are briefly described in the following paragraphs.
Execute Drive Diags (90h)
This command is executed regardless of the state of the DRV bit. The command
causes an actual microprocessor reset (drive loses all logical position
information). Power-up diagnostics are performed, and the PDIAG/DASP
handshake is performed per ATA-2 specification. The master device will
generate an interrupt.
Idle Immediate (E1h)
This command causes the device to set its Power Mode state to Idle and to
generate an interrupt. Although the drive has no actual power saving features,
this command is emulated for software compatibility.
Standby Immediate (E0h)
This command causes the device to set its Power Mode state to Standby and to
generate an interrupt. Although the drive has no actual power saving features,
this command is emulated for software compatibility.
Check Power Mode (E5h)
This command causes the device to return its Power Mode state in the Int
Reason register, and generate an interrupt. If the drive is in Standby mode, this
command returns 00h in the Int Reason register, otherwise this command
returns FFh in the Int Reason register (indicating IDLE mode).
Previous Cmd Int Reason
Reset/Power-up FFh (Idle)
Standby Immed. 00h (Standby)
Idle Immediate FFh (Idle)
Any Other Cmd FFh (Idle)
Sleep (E6)
This command is treated as an Idle command and does NOT prevent the drive
from responding to further commands.