Dtyjlui

I've copied more than 300 Go data on a 2 To flash drive, from a Ubuntu 16.04, then formatted that PC and installed Ubuntu 18.04.

The flash disk is exFAT partition, when I mounted it, I had to install some package to be able to mount it (exfat-fuse and exfat-utils). But the weird thing that I can see all the folders, but not the data within it :

Sys. de fichiers Taille Utilisé Dispo Uti% Monté sur

/dev/sdb1          2,0T    267G  1,7T  14% /media/sazzabi/MAGIC

Can you help me please, I have me lifetime photos on that flash disk, it happened to me before and I lost more than 120 Go (with other flash disks, other PCs, etc..)

I think it's related to the chown user (same username on both PCs), and when I try to ls the folders I got :

ls: lecture du répertoire 'Photos/Photos Dropbox/': Erreur d'entrée/sortie

total 0

It IS about ownership, but not quite the way you think.

Inspect the way the USB Disk is mounted, with:

mount | grep MAGIC

Then, read man mount, especially the sections "FILESYSTEM-INDEPENDENT MOUNT OPTIONS" and "FILESYSTEM-SPECIFIC MOUNT OPTIONS" (the "Mount options for fat" part).

Then, do something like:

sudo mount -o remount,rw,user,users,nosuid,nodev,relatime,uid=$(id -u),gid=$(id -g),fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,showexec,utf8,flush,errors=remount-ro,uhelper=udisks2 /dev/sdb1 /media/sazzabi/MAGIC

Then, inspect the mount | grep MAGIC again.

Questionner ( @seifallah-azzabi )says: (moved up from comments to improve searchability)

The first command gave me this result

/dev/sdb1 on /media/sazzabi/MAGIC type fuseblk (rw,nosuid,nodev,relatime,user_id=0,group_id=0,default_permissions,allow_other,blksize=4096,uhelper=udisks2)

after running the second command, this is the result of

mount | grep MAGIC 

/dev/sdb1 on /media/sazzabi/MAGIC type fuseblk rw,nosuid,nodev,noexec,relatime,user_id=0,group_id=0,default_permissions,allow_other,blksize=4096,user,uhelper=udisks2)

@waltinator responds:

For some reason (you're running the command from a root shell?), $(id -u) and $(id -g) returned root's UID and GID. I expected them to return your USER UID and GID. Or you have to umount first.

Substitute your own UID and GID. getent passwd $USER | cut -d: -f3,4 to see them, or id.

Rather than trying to remount on /media/sazzabi/MAGIC,

(only once)

mkdir -p $HOME/mnt/MAGIC

Then,

sudo umount /dev/sdb1 

followed by

sudo mount -o rw,user,users,nosuid,nodev,relatime,uid=$(id -u),gid=$(id -g),fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,showexec,utf8,flush,errors=remount-ro,uhelper=udisks2 /dev/sdb1 $HOME/mnt/MAGIC

# no "remount,", different mount point

Then, you should have owner access to the files on $HOME/mnt/MAGIC/.