Bart, > I think this means that the SCSI standards support physical blocks > that are smaller than the logical block size. It's just boilerplate weasel wording to avoid breaking the seal of compliance for any devices that may have done something like this in the past. > However, as far as I know the Linux kernel does not try to determine > the physical block size in this case. As one can see in > drivers/scsi/sd.c LBPPBE == 0 is treated as one physical block per > logical block: > > /* Logical blocks per physical block exponent */ > sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size; Yep. It's the only sensible choice. There is no way for the device to report a physical block size smaller than the logical block size. Also, there is no way for us to send a read or a write operation to a block smaller than the reported logical block size. -- Martin K. Petersen
