This looks like the same bug we are seeing in GParted:
https://bugzilla.gnome.org/show_bug.cgi?id=693955
This is caused by an incorrect test in mkdosfs whether a device is a
"hard disk":
if (fstat(dev, &statbuf) < 0)
die("unable to stat %s");
if (!S_ISBLK(statbuf.st_mode)) {
statbuf.st_rdev = 0;
check = 0;
} else
/*
* Ignore any 'full' fixed disk devices, if -I is not given.
* On a MO-disk one doesn't need partitions. The filesytem can go
* directly to the whole disk. Under other OSes this is known as
* the 'superfloppy' format. As I don't know how to find out if
* this is a MO disk I introduce a -I (ignore) switch. -Joey
*/
if (!ignore_full_disk && ((statbuf.st_rdev & 0xff3f) == 0x0300 ||
/* hda, hdb */
(statbuf.st_rdev & 0xff0f) == 0x0800 ||
/* sd */
(statbuf.st_rdev & 0xff3f) == 0x0d00 ||
/* xd */
(statbuf.st_rdev & 0xff3f) == 0x1600) /* hdc,
hdd */
)
die("Device partition expected, not making filesystem on entire device
'%s' (use -I to override)");
It makes certain apparently incorrect assumptions about how raw device numbers
for full disks vs. partitions look like.
(It also doesn't use major()/minor() on the raw device number, which looks not
very portable or future-proof to me...)
** Bug watch added: GNOME Bug Tracker #693955
https://bugzilla.gnome.org/show_bug.cgi?id=693955
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https://bugs.launchpad.net/bugs/935480
Title:
mkdosfs refuses to run on /dev/loop0p1
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