RE: Researching ATA TRIM command

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Yes.

Here is some additonal info: in libata-scsi.c


                tf->protocol = ATA_PROT_DMA;
2983        tf->hob_feature = 0;
2984        tf->feature = ATA_DSM_TRIM;                //0x01
2985        tf->hob_nsect = (size / 512) >> 8;
2986        tf->nsect = size / 512;
2987        tf->command = ATA_CMD_DSM;          //0x06
2988        tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 |
2989                     ATA_TFLAG_WRITE;
2990

________________________________________
From: Simon Kitching [simon.kitching@xxxxxxxxxx]
Sent: Thursday, April 15, 2010 3:18 PM
To: Bill Weiler
Cc: kernelnewbie
Subject: Re: Researching ATA TRIM command

On Thu, 2010-04-15 at 14:25 -0700, Bill Weiler wrote:
> All,
>         I found the task file call in libata-scsi.c in kernel 2.6.33.
>
>         TRIM seem to be a SCSI to ATA translation of "WRITE SAME 16".
>
>         Under what conditions would "WRITE SAME 16" be called?
>
>         (I am not as familiar with SCSI as I am with ATA).


Is this the TRIM operation you are asking about?

http://en.wikipedia.org/wiki/TRIM



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