I've done the calculation again to get the range of sectors within picture number 12121, which runs from &46EF0 and &46F08. The actual sector number we requested is not in this range. However, this is because there is no way of passing the low byte of the sector number in the SCSI command block, so this defaults to zero. This gives an actual sector number requested of &46F00, which is located in picture number 12121.

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