Date: Thu, 29 Aug 1996 16:50:35 +1000 From: Bruce Evans <bde@zeta.org.au> To: hackers@FreeBSD.org, rnordier@iafrica.com Subject: Re: Determining disk type & size Message-ID: <199608290650.QAA31554@godzilla.zeta.org.au>
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>Could anyone tell me if there is a quick and easy way to do the
>following:
>For a given (block special) device, determine whether it represents
>
> (1) a floppy disk
> (2) a hard disk slice that contains a filesystem (probably not ufs)
> (3) anything else (not interested, but could be cdrom, tape, etc)
>and, given this info, the size (in bytes or 512-byte sectors) of the
>disk or slice itself. For example:
>
> device blocks
> ---------- ------
> /dev/fd1 2400
> /dev/wd0s1 65457
> /dev/wd0 (error)
No easy way. Perhaps no way.
>./fdtest /dev/fd0
>sectors per cylinder: 158 [<-- 30 expected]
> if (ioctl(fd, DIOCGDINFO, &dl) == -1)
> err(1, argv[1]);
> printf("sectors per cylinder: %lu\n", dl.d_secpercyl);
DIOCGDINFO for floppies just returns whatever happens to be in the label
area on the disk (*). The label is garbage unless the disk actually has
a label. There is no way to tell from the ioctl() return value whether
the label is garbage.
Bruce
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