I use an external hard drive to backup my computer to. It's always been reliable.
A few days ago I tried to copy some of the backup files to another external hard drive I got from work. This operation failed (I think there's something wrong with and "Acess Denied" tp that latter drive half way through copying).
Now I cannot delete or copy files from the first, normally reliable drive. I've tried plugging the drive into two different computers running Linux and both reported the same problem
I *can* however write a file to the drive and delete it.

Also, Clonezilla started from a live DVD seems to be able to write to it.

I have no idea what is wrong with the drive, but here is the output of "mount" with the drive plugged in. The drive is sdg1 "Elements":


Code:
[email protected]:~$ mount
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
udev on /dev type devtmpfs (rw,nosuid,noexec,relatime,size=3974244k,nr_inodes=993561,mode=755)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
tmpfs on /run type tmpfs (rw,nosuid,nodev,noexec,relatime,size=804584k,mode=755)
/dev/sda3 on / type ext4 (rw,relatime)
securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
tmpfs on /run/lock type tmpfs (rw,nosuid,nodev,noexec,relatime,size=5120k)
tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,mode=755)
cgroup2 on /sys/fs/cgroup/unified type cgroup2 (rw,nosuid,nodev,noexec,relatime,nsdelegate)
cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,xattr,name=systemd)
pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime)
efivarfs on /sys/firmware/efi/efivars type efivarfs (rw,nosuid,nodev,noexec,relatime)
none on /sys/fs/bpf type bpf (rw,nosuid,nodev,noexec,relatime,mode=700)
cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer)
cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset)
cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime,perf_event)
cgroup on /sys/fs/cgroup/net_cls,net_prio type cgroup (rw,nosuid,nodev,noexec,relatime,net_cls,net_prio)
cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio)
cgroup on /sys/fs/cgroup/pids type cgroup (rw,nosuid,nodev,noexec,relatime,pids)
cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpu,cpuacct)
cgroup on /sys/fs/cgroup/hugetlb type cgroup (rw,nosuid,nodev,noexec,relatime,hugetlb)
cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,memory)
cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices)
cgroup on /sys/fs/cgroup/rdma type cgroup (rw,nosuid,nodev,noexec,relatime,rdma)
systemd-1 on /proc/sys/fs/binfmt_misc type autofs (rw,relatime,fd=28,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=21142)​
mqueue on /dev/mqueue type mqueue (rw,nosuid,nodev,noexec,relatime)
hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime,pagesize=2M)
debugfs on /sys/kernel/debug type debugfs (rw,nosuid,nodev,noexec,relatime)
tracefs on /sys/kernel/tracing type tracefs (rw,nosuid,nodev,noexec,relatime)
fusectl on /sys/fs/fuse/connections type fusectl (rw,nosuid,nodev,noexec,relatime)
configfs on /sys/kernel/config type configfs (rw,nosuid,nodev,noexec,relatime)
/var/lib/snapd/snaps/core18_1997.snap on /snap/core18/1997 type squashfs (ro,nodev,relatime,x-gdu.hide)
/var/lib/snapd/snaps/core18_1988.snap on /snap/core18/1988 type squashfs (ro,nodev,relatime,x-gdu.hide)
/var/lib/snapd/snaps/core_10908.snap on /snap/core/10908 type squashfs (ro,nodev,relatime,x-gdu.hide)
/var/lib/snapd/snaps/gtk2-common-themes_13.snap on /snap/gtk2-common-themes/13 type squashfs (ro,nodev,relatime,x-gdu.hide)
/var/lib/snapd/snaps/gtk-common-themes_1514.snap on /snap/gtk-common-themes/1514 type squashfs (ro,nodev,relatime,x-gdu.hide)
/var/lib/snapd/snaps/gnome-3-34-1804_66.snap on /snap/gnome-3-34-1804/66 type squashfs (ro,nodev,relatime,x-gdu.hide)
/var/lib/snapd/snaps/kompozer_4.snap on /snap/kompozer/4 type squashfs (ro,nodev,relatime,x-gdu.hide)                                                                                       
/var/lib/snapd/snaps/protracker_125.snap on /snap/protracker/125 type squashfs (ro,nodev,relatime,x-gdu.hide)                                                                               
/var/lib/snapd/snaps/puddletag-snap_3.snap on /snap/puddletag-snap/3 type squashfs (ro,nodev,relatime,x-gdu.hide)                                                                           
/var/lib/snapd/snaps/snapd_11402.snap on /snap/snapd/11402 type squashfs (ro,nodev,relatime,x-gdu.hide)                                                                                     
/var/lib/snapd/snaps/kde-frameworks-5-core18_32.snap on /snap/kde-frameworks-5-core18/32 type squashfs (ro,nodev,relatime,x-gdu.hide)                                                       
/var/lib/snapd/snaps/youtube-dl_3805.snap on /snap/youtube-dl/3805 type squashfs (ro,nodev,relatime,x-gdu.hide)                                                                             
/var/lib/snapd/snaps/synfigstudio_2.snap on /snap/synfigstudio/2 type squashfs (ro,nodev,relatime,x-gdu.hide)                                                                               
/dev/sda1 on /boot/efi type vfat (rw,relatime,fmask=0077,dmask=0077,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro)                                                     
binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,nosuid,nodev,noexec,relatime)
tmpfs on /run/user/1000 type tmpfs (rw,nosuid,nodev,relatime,size=804580k,mode=700,uid=1000,gid=1001)
gvfsd-fuse on /run/user/1000/gvfs type fuse.gvfsd-fuse (rw,nosuid,nodev,relatime,user_id=1000,group_id=1001)
/dev/sdg1 on /media/brent/Elements type ext4 (rw,nosuid,nodev,relatime,uhelper=udisks2)
/dev/sdb1 on /media/brent/Media_Drive type fuseblk (rw,nosuid,nodev,relatime,user_id=0,group_id=0,default_permissions,allow_other,b​lksize=4096,uhelper=udisks2)