Cannot mount an older disk

[Bob Eager]

On Tue, 8 Oct 2019 21:35:07 -0400
"Mikhail T." <mi+t at aldan.algebra.com> wrote:

> Hello!
> 
> Going through older hard drives, I found one that still seems to work 
> and was curious, what's on it. The OS -- 12.1-STABLE -- sees it find. 
> The disklabel seems sane (except for the number of partitions):
> 
>     # /dev/ada1:
>     8 partitions:
>     #          size     offset    fstype   [fsize bsize bps/cpg]
>        b:   12582912          0      swap
>        c: 1465149168          0    unused        0     0 # "raw" part,
>     don't edit
>        d: 1452566256   12582912    4.2BSD     8192 65536 52352
> 
> and there are ada1, ada1b, and ada1d entries under /dev. So far so
> good. Unfortunately, both mount and fsck tell me the same blatant
> lie, that the device does not exist:
> 
>     # fsck -y /dev/ada1d
>     Can't open /dev/ada1d: No such file or directory
> 
>     # mount /dev/ada1d /mnt
>     mount: /dev/ada1d: No such file or directory
> 
> Any suggestions? Thank you! Yours,

Custom kernel? If so, try booting GENERIC. Might be that a support fs
option is missing.