Samsung 100737108-A

The contents of the Command Block registers, following the transfer of a data block, which had a sector in

error, are undefined. The host should retry the transfer as individual requests to obtain valid error info rmation.

Subsequent blocks are transferred only if the error was a correctable data error. All other errors cause the

command to stop after transfer of the block, which contained the error. Interrupts are generated when DRQ is

set at the beginning of each block.

8.2.18 Read Native Max Address (F8h, 27h: extended)

This co mmand returns the native maximum address. The native maximum address is the highest address

accepted by the device in the factory default condition. The native maximum add ress is the maximum

address that is valid when using the SET MAX ADDRESS command.

This command reads from 1 to 256 sectors as specified in the Sector Count register. A sector counts of 0

requests all 256 sectors if the command is Read Sectors (not Read Sector Extended). The transfer begins at

the sector specified in the Sector Number register.

If the drive is not already on the desired track, an implied seek is performed. Once at the desired track, the

drive searches for the appropriate ID field.

If the ID is read correctly, the data address mark shall b e recognized within a specified number of bytes, or

the Address Mark Not Found error is posted. DRQ is always set prior to data transfer, regardless of the

presence or absence of an error condition.

At command co mpletion, the Command Block registers contain the address of the last sector read. If an error

occurs, the read terminates at the sector where the error occurred. The Command Block registers contain the

address of the sector where the error occur red.

This command is obsolete in the ATA7 specification. The supporting of this command is for backwar d

compatibility purpose. The use of this command is beyond th e ATA st andard and not recommended by the

manufacturer.

This co mmand is identical to the Read Sectors command, except that DRQ is never se t, and no data is

transferred to the host.

When the requested sectors have been verified, the drive clears BSY and generates an interrupt. Upon

command completion, the Command Block registers contain the address of the last sector verified. If an error

occurs, the Verify terminates at the sector where the erro r occurred.

The Command Block registers contain the address of where the error occurred. The Sector Count register

contains the number of sectors not yet verified .