If you're talking about an MS-DOS disk, then yes, it contains
a DOS partition which is formatted. In FreeBSD, we would call
it a slice (slice == "DOS primary partition"). In this case,
there is no (sub)partitioning, the _slice_ carries the MS-DOS
unless you need windows 98 support partitionless USB drives works
absolutely fine
clear it out
dd if=/dev/zero of=/dev/da0 bs=64k count=1
format
newfs_msdos /dev/da0
Same question for CDs?
Not sure. A CD contains an ISO-9660 file system without an
enclosing partition per se.
In FreeBSD (as well as NetBSD, OpenBSD, maybe linux) CD is just block
device. You may make disklabel on it, and whatever you like.
In excuse of OS (windows) CD/DVD MUST BE CD9660 or UDF formatted without
partitions.
You may record NTFS formatted DVD, perfectly readable on FReeBSD,
unreadable under windows in spite it is windows native filesystem.
------
You may actually make "hybrid" DVD that will show whatever you want under
windoze, and have real data in tar format.
below the recipe:
1) prepare windows-vizible layout, all needed viruses and autorun.inf in
some directory and do
mkisofs -J -q .|dd of=/path/to/tempfile bs=512 skip=1
2)
tar cf - /path/to/tempfile ...list of what you want to be tarred...|growisofs
-dvd-compat -Z /dev/cd0=-
now use tar to read files from that DVD, while in windows it will run
viruses properly.
a virtual partition?
As devices and "real files" are "quite the same", you can mount
a file system that is contained in a file. You typically do this
when doing data recovery and forensic analysis, where your starting
point is an image file of a disk, a slice or a partition. You
then "connect" it to a virtual node (vnconfig - e. g. md0) and
vnconfig is quite in old FreeBSD
today it is mdconfig
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