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I'm looking at WD Mybook disk, connected via USB as disk sde. Now, fdisk -l /dev/sde tells me that the single partition on the drive is:

Device     Start         End     Sectors  Size Type
/dev/sde1   2048 15628050431 15628048384  7.3T Microsoft basic data

but what's that? I don't quite understand what the Wikipedia page is telling me about this partition type. It seems to be auto-mounted fine, and still I don't undestand what filesystem is in use.

muru
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einpoklum
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  • This looks like an effective duplicate of How do I find out what filesystem FUSE is using?. – Hermann Mar 24 '21 at 16:12
  • Parted also shows it. But link to duplicate using lsblk is probably better as with lsblk, you can show many different options. sudo parted -l – oldfred Mar 24 '21 at 16:29
  • Please add a little more information to the question: does "in use" mean "active and mounted" or "I've been told it contains some data, how to access it?" Is this disk fresh from factory, or is it a previously-used mystery box you'll need to figure out? If it's in a factory-default state, I'd place my bets on "either NTFS or exFAT". file -s /dev/sde1 might yield more clues. – telcoM Mar 24 '21 at 18:33

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You could use a graphical partition editor like GParted to find out which filesystem is on your partition or you could use the command lsblk -f, it should list your filesystem.