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T13/2132-D Revision 3 June 23, 2010
34 Working Draft Enhanced Disk Drive - 4 (EDD-4)
8.6 Verify Sectors (FN 04h)
This function shall be used to check the sectors in the specified range on the device for errors. No data is
transferred between the host and device by this command.
Entry
AH 04h
AL Number of sectors to verify, shall be greater than 0 and less than 128
CH Low order 8 bits of the cylinder number
CL
Bit Description
7:6 high order 2 bits of the cylinder
5:0 sector number
DH Head number
DL BIOS device number
Exit
Carry Clear Function completed without error
AH Shall be cleared to zero
AL Number of sectors verified
Carry Set Function completed with an error
AH Shall be set to the error code
AL Vendor Specific