Samsung 100737108-A ,

Spinpoint M8-DVR OEM Product Manual REV 1.0

If the drive enters NCQ mode and a non-queue command is received, the drive will respond with error to

inform host a queue command been overlapped with non-queue. If a queue tag is not finished and anoth er

same tag command is received, the drive will response with error to inform host a duplicated tag is received.

Error information is reported accord ing to the SATA II specification. A read Log Extended command with

log page 10 is required to retrieve the error informatio n.

This command returns the specified log to the host. The device shall interrupt for each DRQ block transf erred.

See ATA 7 document for command details.

This command is obsolete in the ATA7 specification.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

compatibility purpose. The use of this command is beyond the ATA standard and not recommended by the

manufacture.

The Read Long command performs similarl y to the Read Sectors command except that it returns the data and

the ECC bytes appended to the data field of the desired sector. During a Read Long comman d, the drive does

not check the ECC bytes to determine if there has been a data error. Only single sector Read Long operations

are supported.

The transfer of the ECC bytes shall be 8 bits wide and 4 or device n ative ECC bytes length.

8.2.17 Read Multiple Command (C4h, 29h: extended)

The Read Multiple command performs similarly to th e Read Sectors command except interrupts are not

generated on every sector, but on the transfer of a block which contains the number of sectors defined by a

Set Multiple command.

Command execution is identical to the Read Sectors operation except that the numbers of sectors as defined

by a Set of Multiple command are transferred without intervening interrupts. DRQ qualification of the

transfer is required only at the start of the data block, not on each sector.

The block count of sectors to be transferred without intervening interrupts is programmed by the Set Multiple

Mode command, which should be executed prior to the Read Multiple command. When the Read Mult iple

command is issued, the Sector Count register contains the number of sectors (not the number of blocks or the

block count) requested.

If the number of requested secto rs is not evenly divisible by the b lock count, as many full blocks as possible

are transferred, followed by a final, partial block transfer. The partial block transfer shall be for n sector s,

where

n = Remainder (Sector Count / Block Count)

If the Read Multiple command is attempted before the Set Multiple Mode command has been executed or

when Read Multiple commands are disabled, then the Read Multiple operation is rejected with an Aborted

Command error.

Disk errors encountered during Read Multiple commands are posted at the beginning of the block or partial

block transfer, but DRQ is still set and the data transfer takes place as it normally would, including transfer of

corrupted data, if any.