
186 The Essential Guide to Serial ATA and SATA Express
Features Current –
Number of sectors to be transferred low order, bits (7:0).
Features Previous –
Number of sectors to be transferred high order, bits (15:8). 0000h in the Features register specifies
that 65,536 sectors are to be transferred.
Sector Count Current –
If the device supports command queuing, bits (7:3) contain the Tag for the command being
delivered. A Tag value may be any value between 0 and 31, regardless of the queue depth sup-
ported. If queuing is not supported, this register will be set to the value 00h.
Sector Count Previous – Reserved
LBA Low Current – LBA (7:0).
LBA Low ...