I have a 2TiB disk with exFat video on. I discovered that fdisk gives this message:

Welcome to fdisk (util-linux 2.25.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.

/dev/sdd: device contains a valid 'ext4' signature, **it's strongly recommended to wipe the device by command wipefs(8)** if this setup is unexpected to avoid possible collisions.

Device does not contain a recognized partition table.
Created a new DOS disklabel with disk identifier 0x2e78422e.

Command (m for Help): p

Disk /dev/sdd : 1.8 TiB, 2000398934016 bytes, 3907029168 sectors
Units : sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: dos
Disk identifier: 0x2e78422e

Command (m for Help): m


   a   toggle a bootable flag
   b   edit nested BSD disklabel
   c   toggle the dos compatibility flag

  • Can I continue to work like this: new write will not destroy anything?
  • Can I save MBR with dd if=... of= with 512 bytes?
  • What are the action to do to secure the disk without loss (no complete save actually)?

EDIT after comment

sudo lsblk -f /dev/sdd
NAME --- FSTYPE ---  LABEL      ---   UUID                                 --- MOUNTPOINT
sdd  --- ext4   ---  3_HOME_2To ---   449db187-f86f-4a38-bf02-076f0beba3bd --- /2tera
  • What is supposed to be exFat video ?? Post ouput of sudo lsblk -f /dev/sdd. What do you want to achieve ? Current setup is fine if it works for you. There is no MBR so you want can't save it. – solsTiCe Jul 15 '15 at 9:41
  • @solsTiCe I've had en edit in the question – cl-r Jul 15 '15 at 10:47
  • @solsTiCe Videos are taken from an exFat disk for Windows ; files are like this -rwx------ 1 cylere cylere 14564660140 avril 24 06:09 noelle et miguel 21.mov* -rwx------ 1 cylere cylere 14543014844 avril 23 14:50 noelle et miguel 22.mov* – cl-r Jul 15 '15 at 10:57
  • @solsTiCe I've done fdisk from root : Disklabel type: dos Disk identifier: 0x307d4135 Identifier is different from the one I posted (no umount between). And mix ext4/dos label is always here. – cl-r Jul 15 '15 at 11:05
  • what is the problem ? – solsTiCe Jul 15 '15 at 11:08

fdisk doesn't like the fact that there is no MBR. You have a filesystem directly on disk without any partition and MBR.

This is fine for Ubuntu. Disregard this message from fdisk and don't use wipefs, otherwise you will lose all your data.

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