520 Bytes sector size

520 Bytes sector size

[Dan Porat]

I would like to run 520 Bytes disk in native mode.
What changes I have to run in sg driver ?
Is there any kernel already adapted for 520 bytes sector size ?

Thanks

Dan Porat

Re: 520 Bytes sector size

[Martin K. Petersen]

>>>>> "Dan" == Dan Porat <dan.porat@gmail.com> writes:

Dan> I would like to run 520 Bytes disk in native mode.  What changes I
Dan> have to run in sg driver ?  Is there any kernel already adapted for
Dan> 520 bytes sector size ?

Linux does not support 520-byte sectors unless the drive is formatted
with DIF and hanging off a DIF-capable HBA.

-- 
Martin K. Petersen	Oracle Linux Engineering

Re: 520 Bytes sector size

[Alan Cox]

On Tue, 02 Feb 2010 18:04:11 -0500
"Martin K. Petersen" <martin.petersen@oracle.com> wrote:

> >>>>> "Dan" == Dan Porat <dan.porat@gmail.com> writes:
> 
> Dan> I would like to run 520 Bytes disk in native mode.  What changes I
> Dan> have to run in sg driver ?  Is there any kernel already adapted for
> Dan> 520 bytes sector size ?
> 
> Linux does not support 520-byte sectors unless the drive is formatted
> with DIF and hanging off a DIF-capable HBA.

Is that true even with sg - I wouldn't have thought sg minded, it doesn't
seem to mind about strange sized transfers for CD-ROM ?

Re: 520 Bytes sector size

[Martin K. Petersen]

>>>>> "Alan" == Alan Cox <alan@lxorguk.ukuu.org.uk> writes:

>> Linux does not support 520-byte sectors unless the drive is formatted
>> with DIF and hanging off a DIF-capable HBA.

Alan> Is that true even with sg - I wouldn't have thought sg minded, it
Alan> doesn't seem to mind about strange sized transfers for CD-ROM ?

Did not work last I mucked with it a while back.  If I recall correctly
there were a few places where we assumed multiples of 512.

-- 
Martin K. Petersen	Oracle Linux Engineering

Re: 520 Bytes sector size

[Mark Lord]

Alan Cox wrote:
> On Tue, 02 Feb 2010 18:04:11 -0500
> "Martin K. Petersen" <martin.petersen@oracle.com> wrote:
> 
>>>>>>> "Dan" == Dan Porat <dan.porat@gmail.com> writes:
>> Dan> I would like to run 520 Bytes disk in native mode.  What changes I
>> Dan> have to run in sg driver ?  Is there any kernel already adapted for
>> Dan> 520 bytes sector size ?
>>
>> Linux does not support 520-byte sectors unless the drive is formatted
>> with DIF and hanging off a DIF-capable HBA.
..

The ATA READ_LONG and WRITE_LONG commands both use 520 byte sectors,
and both work with libata.

-ml

Re: 520 Bytes sector size

[Dan Porat]

I see , but aren't all the commands (including FPDMA) , shoudl work in
520 mode , when the disk is formatted to 520 ?

Thanks


On Wed, Feb 3, 2010 at 7:19 PM, Mark Lord <kernel@teksavvy.com> wrote:
> Alan Cox wrote:
>>
>> On Tue, 02 Feb 2010 18:04:11 -0500
>> "Martin K. Petersen" <martin.petersen@oracle.com> wrote:
>>
>>>>>>>> "Dan" == Dan Porat <dan.porat@gmail.com> writes:
>>>
>>> Dan> I would like to run 520 Bytes disk in native mode.  What changes I
>>> Dan> have to run in sg driver ?  Is there any kernel already adapted for
>>> Dan> 520 bytes sector size ?
>>>
>>> Linux does not support 520-byte sectors unless the drive is formatted
>>> with DIF and hanging off a DIF-capable HBA.
>
> ..
>
> The ATA READ_LONG and WRITE_LONG commands both use 520 byte sectors,
> and both work with libata.
>
> -ml
>

Re: 520 Bytes sector size

[Mark Lord]

Dan Porat wrote:
> I see , but aren't all the commands (including FPDMA) , shoudl work in
> 520 mode , when the disk is formatted to 520 ?
..

How does one "Format to 520" ??

Re: 520 Bytes sector size

[Dan Porat]

Some high-end storage disks are formatted to sectors of 520.
They save the payload with the DIF .

This is the disk I have.

Thanks


On Sun, Feb 7, 2010 at 6:12 PM, Mark Lord <kernel@teksavvy.com> wrote:
> Dan Porat wrote:
>>
>> I see , but aren't all the commands (including FPDMA) , shoudl work in
>> 520 mode , when the disk is formatted to 520 ?
>
> ..
>
> How does one "Format to 520" ??
>