ATAPI Interface Chapter 5
Seagate Travan 40 Product Manual Page 107
NOP (ATA Command 00)
This command allows a Host that only performs 16-bit register accesses, to check
device status.
If this command is supported, the drive shall respond, as it does to an unrecognized
command by setting the ABRT bit to 1 in the Error register, setting the Error bit in
the Status Register, clearing the BSY to 0 in the Status Register, and asserting
INTRQ signal.
This command is not supported. The device will abort the command.
Host Taskfile Registers—Inputs
Data Bits
Host Taskfile
Register 7 6 5 4 3 2 1 0 HEX
Features N/A N/A
Sector Count N/A N/A
Sector
Number N/A N/A
Byte Count
High N/A N/A
Byte Count
Low N/A N/A
Device/Head rsvd LBA rsvd DEV SAM LUN (not used)
Command command 00
Host Taskfile Registers—Outputs
Data Bits
Host Taskfile
Register 7 6 5 4 3 2 1 0 HEX
Error rsvd tag type (not supported) MCH ABRT EOM ILI 04
Sector Count not changed 00
Sector
Number not changed 00
Byte Count
High not changed 00
Byte Count
Low not changed 00
Device/Head rsvd LBA rsvd DEV SAM LUN (not used)
Status BSY RDY rsvd DSC DRQ Corr rsvd CHK 00