IBM IC35L020 - Deskstar 20 GB Hard Drive Specifications page 196

Input parameters from the device on bus release
Sector Count
Sector Number, Cylinder High/Low, H n/a.
SRV
Input parameters from the device on Command Complete
Sector Count
Sector Number, Cylinder High/Low, H
SRV
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.
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.
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.
These parameters represent the sector address of unrecoverable
error—applicable only when an unrecoverable error has occurred.
This parameter means cleared to 0.
Deskstar 60 GXP Hard disk drive specification
182