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ATA Bus Interface and ATA Commands
6-16 Maxtor D540X-4K 20.4/40.0/60.0/80.0 GB AT
WCE – Write Cache Enable (Byte 39, Bit 2): When this bit is set to1, the Maxtor
D540X-4K 20.4/40.0/60.0/80.0 GB AT hard disk drives enable the Write Cache.
This indicates that the drive returns GOOD status for a write command after
successfully receiving the data, but before writing it to the disk. A value of zero
indicates that the drive returns GOOD status for a write command after successfully
receiving the data and writing it to the disk.
If the next command is another WRITE command, cached data continues to be
written to the disk while new data is added to the buffer. The default setting is 1.
RUEE – Reallocate Uncorrectable Error Enables (Byte 39, Bit 1): When set
to 1, this bit indicates that the Maxtor D540X-4K 20.4/40.0/60.0/80.0 GB AT hard
disk drives will automatically reallocate uncorrectable hard errors, if the ARR bit (byte
36, bit 6) is set to 1. The default setting is 1.
COMMAND CODE - B0h
TYPE - Optional - SMART Feature set. If the SMART feature set is implemented,
this command is optional and not recommended.
PROTOCOL - PIO data in
INPUTS - The Features register shall be set to D1h. The Cylinder Low register shall
be set to 4Fh. The Cylinder High register shall be set to C2h.
NORMAL OUTPUTS - None
ERROR OUTPUTS - If the device does not support this command, if SMART
disabled or if the values in the Features, Cylinder Low or Cylinder High registers are
invalid, an Aborted command error is posted.
Features D1h
Sector Count
Sector Number
Cylinder Low 4Fh
Cylinder High C2h
Device/Head 1 1 D
Command B0h
Error na UNC na IDNF na ABRT na na
Sector Count na
Sector Number na
Cylinder Low na