I've just received my new SSD since the old one died. This Intel 320 SSD supports TRIM. For testing purposes, my dealer put Windows on it, but I want to get rid of this and install Kubuntu on it.
It does not have to be a "secure wipe", I just need the empty the disk in the most healthy way. I believe that dd if=/dev/zero of=/dev/sda
just fills the blocks with zeroes and thereby taking another write (correct me if I'm wrong).
I've seen the answer How to enable TRIM, but it looks like it's suited for clearing empty blocks, not wiping the disk.
hdparm
seems to be the program to do it, but I'm not sure if it clears the disk OR cleans empty blocks. From its manual page:
--trim-sector-ranges For Solid State Drives (SSDs). EXCEPTIONALLY DANGEROUS. DO NOT USE THIS OPTION!! Tells the drive firmware to discard unneeded data sectors, destroying any data that may have been present within them. This makes those sectors available for immediate use by the firmware's garbage collection mechanism, to improve scheduling for wear-leveling of the flash media. This option expects one or more sector range pairs immediately after the option: an LBA starting address, a colon, and a sector count, with no intervening spaces. EXCEPTIONALLY DANGEROUS. DO NOT USE THIS OPTION!!
E.g. hdparm --trim-sector-ranges 1000:4 7894:16 /dev/sdz
How can I make all blocks appear as empty using TRIM?
Best Answer
ATA Secure Erase
You should use the drive's security erase feature.
Make sure the drive Security is not frozen. If it is, it may help to suspend and resume the computer.
The (filtered) command output means that this drive is ”not frozen” and you can continue.
Set a User Password (this password is cleared too, the exact choice does not matter).
Issue the ATA Secure Erase command
Note:
/dev/sdX
is the SSD as a block device that you want to erase.Eins
is the password chosen in this example.See the ATA Secure Erase article in the Linux kernel wiki for complete instructions including troubleshooting.