* blocksize 4096 even for floppy and CDROM?
@ 2022-02-22 20:08 JPT
2022-02-22 23:24 ` Randy Dunlap
0 siblings, 1 reply; 3+ messages in thread
From: JPT @ 2022-02-22 20:08 UTC (permalink / raw)
To: linux-kernel; +Cc: j-p-t
Hi,
sorry for bothering. I fear I need help by a block device pro ;)
I try to read several bad floppies and DVDs using safecopy.
I wonder why safecopy always says
Reported hw blocksize: 4096
Reported low level blocksize: 4096
even if the medium is floppy (512) or CDROM (2048)
is this a kernel issue always assuming min 4k block size?
Does anybody have an idea if there is a Unix out there that doesn't have
this limitation?
or which Linux version dropped support for smaller sectors?
Or is this simply safecopy's fault?
thank you very much for your help.
Jan
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: blocksize 4096 even for floppy and CDROM?
2022-02-22 20:08 blocksize 4096 even for floppy and CDROM? JPT
@ 2022-02-22 23:24 ` Randy Dunlap
2022-02-23 4:00 ` Martin K. Petersen
0 siblings, 1 reply; 3+ messages in thread
From: Randy Dunlap @ 2022-02-22 23:24 UTC (permalink / raw)
To: JPT, linux-kernel, linux-block
[adding the linux-block mailing list]
On 2/22/22 12:08, JPT wrote:
> Hi,
>
> sorry for bothering. I fear I need help by a block device pro ;)
>
> I try to read several bad floppies and DVDs using safecopy.
>
> I wonder why safecopy always says
> Reported hw blocksize: 4096
> Reported low level blocksize: 4096
>
> even if the medium is floppy (512) or CDROM (2048)
>
> is this a kernel issue always assuming min 4k block size?
>
> Does anybody have an idea if there is a Unix out there that doesn't have
> this limitation?
>
> or which Linux version dropped support for smaller sectors?
>
> Or is this simply safecopy's fault?
>
>
> thank you very much for your help.
>
> Jan
--
~Randy
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: blocksize 4096 even for floppy and CDROM?
2022-02-22 23:24 ` Randy Dunlap
@ 2022-02-23 4:00 ` Martin K. Petersen
0 siblings, 0 replies; 3+ messages in thread
From: Martin K. Petersen @ 2022-02-23 4:00 UTC (permalink / raw)
To: Randy Dunlap; +Cc: JPT, linux-kernel, linux-block
Randy,
>> I wonder why safecopy always says
>> Reported hw blocksize: 4096
>> Reported low level blocksize: 4096
>>
>> even if the medium is floppy (512) or CDROM (2048)
>>
>> is this a kernel issue always assuming min 4k block size?
Not sure how safecopy queries the block size. The kernel supports
devices with 512, 1024, 2048, and 4096-byte logical blocks.
--
Martin K. Petersen Oracle Linux Engineering
^ permalink raw reply [flat|nested] 3+ messages in thread
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2022-02-22 20:08 blocksize 4096 even for floppy and CDROM? JPT
2022-02-22 23:24 ` Randy Dunlap
2022-02-23 4:00 ` Martin K. Petersen
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