linux-kernel - Re: blocksize 4096 even for floppy and CDROM?

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Date:   Tue, 22 Feb 2022 15:24:13 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     JPT <j-p-t@....net>, linux-kernel@...r.kernel.org,
        linux-block@...r.kernel.org
Subject: Re: blocksize 4096 even for floppy and CDROM?

[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