Phantom disk usage

technicap · 2024-04-24 20:29:51

I have an external hard drive and after power outage when I tried to make 2 TB qcow2 image the image was not created and I have 1.2 TB of disk usage which I can't seem to find a reason for. I ran

 du -h /mnt/sdb2

and all the files amounted to 600 GB out of 1.8 TB.

Pls advise

seth · 2024-04-24 22:14:51

I have 1.2 TB of disk usage

By what metric (df) on what kind of filesystem (btrfs)?
https://wiki.tnonline.net/w/Btrfs/Balance#How_to_see_actual_disk_usage_(don't_trust_'df')

technicap · 2024-04-25 11:21:35

The filesystem of this disk is exfat. The abnormal usage shows up in df and in dolphin , the file manager. The unaccounted disk usage doesn't show up when checking how much space files use using du and filelight

seth · 2024-04-25 15:05:28

Do you use the fuse driver or the kernel module?
DId you run fsck.exfat in case of the former?
Did you run du as root?

technicap · 2024-04-25 15:39:26

I didn't format the disk. The disk operated without any unaccounted disk usage until the incident described above. It also doest matter what system or distro I use, all of them have unaccounted disk usage. I ran du as root, no difrence beetwen running it as root or not.

Last edited by technicap (2024-04-25 15:41:14)

seth · 2024-04-25 15:45:53

I didn't format the disk.

In case, fsck is "filesystem check", nor "format"

It also doest matter what system or distro I use

There're are two ways to mount an exfat partition: https://wiki.archlinux.org/title/File_s … le_systems
One uses fuse and https://archlinux.org/packages/?name=exfat-utils the other one the kernel module and https://archlinux.org/packages/?name=exfatprogs
This has nothing to do with "system or distro"…

technicap · 2024-04-25 16:04:28

fsck returned that its clean. I have exfatprogs installed and not exfat-utils so I think its the kernel module option

seth · 2024-04-25 16:24:36

Please don't paraphrase, https://bbs.archlinux.org/viewtopic.php?id=57855
Post the actual fsck output, make it "-v" and make sure the FS isn't mounted while running fsck.exfat
Then see https://man.archlinux.org/man/extra/exf … exfat.8.en

It sounds like https://askubuntu.com/questions/1010088 … irectories though (same situation, unclean filesystem exit)
Can you check/repair the filesystem from a windows host?

technicap · 2024-04-25 16:36:22

fsck.exfat -v /dev/sdb2
exfatprogs version : 1.2.2
label: One Touch
sector size:  512.00 B
cluster size: 256.00 KB
volume size:  3.63 TB
/dev/sdb2: clean. directories 5, files 3

I don't have Windows installed on any of my machines.

Edit: Sorry about paraphrassing, force of habit

Last edited by technicap (2024-04-25 16:37:05)

seth · 2024-04-25 17:14:15

There're only 3 files and 5 directories?
Also

all the files amounted to 600 GB out of 1.8 TB

but

volume size:  3.63 TB

fdisk -l /dev/sdb
lsblk -f | grep sdb

technicap · 2024-04-25 17:35:07

all the files amounted to 600 GB out of 1.8 TB

I apologize for confusion. What I meant was "out of all disk space used".

fdisk -l /dev/sdb
GPT PMBR size mismatch (4294967294 != 7814037166) will be corrected by write.
Disk /dev/sdb: 3.64 TiB, 4000787029504 bytes, 7814037167 sectors
Disk model: OneTouch HDD    
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: gpt
Disk identifier: 01000000-0000-0000-4E41-42523945364B

Device      Start        End    Sectors  Size Type
/dev/sdb1      40     409639     409600  200M EFI System
/dev/sdb2  411648 7814035455 7813623808  3.6T Microsoft basic data

lsblk -f | grep sdb
sdb                                                                                        
├─sdb1      vfat   FAT32 EFI           67E3-17ED                                           
└─sdb2      exfat  1.0   One Touch     0017-1B8F                               1.9T    47% /run/media/tomo/One Touch

I compressed the data so I can move it to another disk In case I need to reformat. That disk wasn't reformated since I bought

Last edited by technicap (2024-04-25 17:37:56)

seth · 2024-04-25 21:45:57

What I meant was "out of all disk space used".

Thanks for clearing that up.

Short of checking the FS w/ a windows system I could oly suggest to give exfatfsck from exfat-utils a run, the FS indeed seems to frequently get compromised like this.
If you want to avoid formatting the partition you could try to just copy a lot of data there and then remove it and see whether that sanitizes the file allocation table.

Arch Linux

#1 2024-04-24 20:29:51

Phantom disk usage

#2 2024-04-24 22:14:51

Re: Phantom disk usage

#3 2024-04-25 11:21:35

Re: Phantom disk usage

#4 2024-04-25 15:05:28

Re: Phantom disk usage

#5 2024-04-25 15:39:26

Re: Phantom disk usage

#6 2024-04-25 15:45:53

Re: Phantom disk usage

#7 2024-04-25 16:04:28

Re: Phantom disk usage

#8 2024-04-25 16:24:36

Re: Phantom disk usage

#9 2024-04-25 16:36:22

Re: Phantom disk usage

#10 2024-04-25 17:14:15

Re: Phantom disk usage

#11 2024-04-25 17:35:07

Re: Phantom disk usage

#12 2024-04-25 21:45:57

Re: Phantom disk usage

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