[flalug] filesystem identification

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OK, how does one identify the filesystem on a device? "file" says:

[root@pc root]# file - < /dev/sda
standard input: x86 boot sector

(/dev/sda is one of these, 0.5 GB: http://kasercorp.com/usbjumbo.cfm )

I successfully mounted it as ext2, but just because I happened to *know*
that was what it was. In general, what should I do? How about an offset
that'll skip ahead straight to the filesystem?

      offset in 1K blocks --vvv
dd if=/dev/sda bs=1024 skip=xxx | file -

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