[Discussed] What is /dev/sdc1p1 partition?

makh · 2017-11-12 19:43:20

Hi

I accidently ran this command on flash disk partition.

# fdisk -l /dev/sdc1
Disk /dev/sdc1: 9 GiB, 9657368576 bytes, 18862048 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x6f20736b

Device      Boot      Start        End    Sectors   Size Id Type
/dev/sdc1p1       778135908 1919645538 1141509631 544.3G 72 unknown
/dev/sdc1p2       168689522 2104717761 1936028240 923.2G 65 Novell Netware 386
/dev/sdc1p3      1869881465 3805909656 1936028192 923.2G 79 unknown
/dev/sdc1p4      2885681152 2885736650      55499  27.1M  d unknown

Partition table entries are not in disk order.

Kindly inform what is /dev/sdc1pX?

Most importantly this is a complaint that the ordering is wrong, and also the values are all out of the limits of 9GB.

Thankyou

Last edited by makh (2017-11-13 17:33:30)

jasonwryan · 2017-11-12 19:49:00

Moving to NC...

seth · 2017-11-12 21:23:57

It means that the sdc1 partition header contains some junk that looks like a partition table with nonsense entries.
Is this supposed to be formatted with some same filesystem?

sudo file -s /dev/sdc1

makh · 2017-11-13 11:44:59

Isnt this a small error in the software then?

Trilby · 2017-11-13 12:31:58

What software? It seems to be a small error in the user.

There may be valid use cases for putting a partition table on an existing partition. I don't know of any off hand, but why would software authors intentionally make that impossible to do? There is a unix philosophy which I can't currently find the original source of that says basically that one should not prevent users from doing foolish things as that also prevents them from doing creative things.

If you want to be creative and find a use case for partitioning a partition, great! If you want to be foolish and try to treat a partition as if it had been partitioned, that's on you.

2ManyDogs · 2017-11-13 13:43:16

Trilby wrote:

There is a unix philosophy which I can't currently find the original source of that says basically that one should not prevent users from doing foolish things as that also prevents them from doing creative things.

"Unix was not designed to stop you from doing stupid things, because that would also stop you from doing clever things." -- Doug Gwyn, in Introducing Regular Expressions (2012) by Michael Fitzgerald

Trilby · 2017-11-13 14:30:28

Thanks, that's it.

seth · 2017-11-13 14:44:33

Severely depends on missing answer to

seth wrote:

Is this supposed to be formatted with some same filesystem?
sudo file -s /dev/sdc1

If the file you read has undefined content this could be everything. Applying the "correct" interpretation you may be lucky and can watch it as the latest - let's say "blockbuster".

There's btw. absolutely nothing wrong with random files containing a partition table, disk images are a prominent and regular example.

Arch Linux

#1 2017-11-12 19:43:20

[Discussed] What is /dev/sdc1p1 partition?

#2 2017-11-12 19:49:00

Re: [Discussed] What is /dev/sdc1p1 partition?

#3 2017-11-12 21:23:57

Re: [Discussed] What is /dev/sdc1p1 partition?

#4 2017-11-13 11:44:59

Re: [Discussed] What is /dev/sdc1p1 partition?

#5 2017-11-13 12:31:58

Re: [Discussed] What is /dev/sdc1p1 partition?

#6 2017-11-13 13:43:16

Re: [Discussed] What is /dev/sdc1p1 partition?

#7 2017-11-13 14:30:28

Re: [Discussed] What is /dev/sdc1p1 partition?

#8 2017-11-13 14:44:33

Re: [Discussed] What is /dev/sdc1p1 partition?

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