This message is from the T13 list server.
David F. wrote:
This message is from the T13 list server. You guys may want to consider changing things so that a byte count of zero means 64K. Most drives already support it and the newer BD drives use 64K packets.
Wow, that would sure break a lot of host software - maybe even some automated host controller hardware. ATAPI has never allowed a PIO DRQ block to be more than 65535 bytes (FFFFH bytes). Allowing the PIO Byte Count Limit (BCL) and the DRQ block Byte Count (BC) to use 0000H to mean 65536 bytes would be a major change in the PACKET PIO command protocol with sigificant backward compatibility problems for hosts that use PIO data transfers.
Of course we all understand that the BCL and BC are not used when PACKET commands use DMA for data transfer... right?
Hale -- ++ Hale Landis ++ [EMAIL PROTECTED] ++
