mounting UFS CD-ROMs

[Noah Pratt]

I tried `dd conv=swab`,  and it's not that easy. I gather it's only
the metadata within the filesystem that's affected, so swapping the
whole thing leaves you with garbage. Afterwards, `file` saw it as
"data", where before it at least knew it was a filesystem.

On 8/4/10, xSAPPYx <xsappyx at gmail.com> wrote:
> You could try the conv=swab option to dd
>
> dd if=/dev/acd0 of=5853-5864.iso conv=swab
>
> On Wed, Aug 4, 2010 at 18:04, Noah Pratt <npratt at gmail.com> wrote:
>> On Tue, Aug 3, 2010 at 8:44 PM, Michael Powell <nightrecon at hotmail.com>
>> wrote:
>>> Noah Pratt wrote:
>>>
>>>> Hi,
>>>>
>>>> I have a whole bunch of UFS CD-ROMs, but I'm unable to mount them on
>>>> my FreeBSD 8 system.
>>>> I thought it would be possible. From the FAQ:
>>>> http://www.freebsd.org/doc/en/books/faq/disks.html
>>>>
>>>>     UFS CD-ROMs can be mounted directly on FreeBSD. Mounting disk
>>>> partitions from Digital UNIX and other systems that support UFS may be
>>>> more complex, depending on the details of the disk partitioning for
>>>> the operating system in question.
>>>>
>>>>
>>>> I tried the direct route:
>>>>
>>>> 6930p# file -s /dev/acd0t01
>>>> /dev/acd0: Unix Fast File system [v1] (big-endian), last mounted on
>>>                                         ^^^^^^^^^^
>>> [snip]
>>>>
>>>> 6930p# uname -a
>>>> FreeBSD 6930p.domain.com 8.0-STABLE FreeBSD 8.0-STABLE #1: Mon May 17
>>>> 01:26:14 PDT 2010
>>>> root at 6930p.domain.com:/usr/obj/usr/src/sys/GENERIC  amd64
>>>>
>>>>
>>>> Am I missing something that ought to be obvious? [probable]
>>>> Is it no longer possible to mount UFS filesystems? [unlikely ;-) ]
>>>> Is there something specific about *this* UFS filesystem that prevents
>>>> it from working?
>>>>
>>>
>>> I suspect maybe the disk was written using Solaris on SPARC, which is
>>> big-
>>> endian. Most PC architectures are little-endian.
>>>
>>> -Mike
>>
>>
>>
>> Yes, the CDs were created in Solaris on SPARC. (I think it was a Sparc
>> 10...)
>> And yes, my FreeBSD system is an Intel Core2Duo.
>>
>> In Linux, copying the disc and mounting the disc image via loopback
>> worked great:
>>   ubuntu# cat /dev/cdrom > cd-image
>>   ubuntu# mount -t ufs -o ro,loop cd-image /mnt
>>
>> It looks like NetBSD has a kernel build option FFS_EI, to enable
>> fsck_ffs -B to convert the byte order.
>> (I don't have a NetBSD system to test though.)
>>
>> I even found a Windows program called R-Studio ( http://www.r-tt.com/
>> ) that was able to recover data from these discs.
>>
>> Can the filesystem's endianness be converted in FreeBSD?
>>
>>
>>
>> Thanks a lot!
>>
>> -Noah
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>