yesterday i tried turning on my toshiba satellite laptop but it started booting and crashed after showing a blue screen for half a second. and before i reinstall windows ,i want to backup my files, so i created a bootable ubuntu usb drive, I booted from usb and i clicked try ubuntu, and then when i tried accessing my hdd's it says unable to mount XXXXXXXXXX Adding read ACL for uid 999 to `/media/ubuntu' failed: Operation not supported so is that because i clicked try ubuntu? or my hdd is dead?
Your hard drive is not dead, but you won't be able to access it because Windows has marked the drive as in use.
Open a termainal, and type
Now, using this, run