Input parameters from the device on bus release
Sector Count 
Bits 7–3 (Tag) contain the Tag of the command being released to the 
bus.
Bit 2 (REL) is set to one.
Bit 1 (I/O) is cleared to zero.
Bit 0 (C/D) is cleared to zero.
Sector Number, Cylinder High/Low, H 
n/a.
SRV 
This parameter is cleared to zero when the device performs a bus release. This
bit is set to 1 when the device is ready to transfer data.
Input parameters from the device on Command Complete
Sector Count 
Bits 7–3 (Tag) contain the Tag of the completed command.
Bit 2 (REL) is cleared to 0.
Bit 1 (I/O) is set to one.
Bit 0 (C/D) is set to one.
Sector Number, Cylinder High/Low, H 
These parameters represent the sector address of unrecoverable
error—applicable only when an unrecoverable error has occurred.
SRV
This parameter means cleared to 0.
Deskstar  60 GXP Hard disk drive specification
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