Disk wiping: Difference between revisions
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* To wipe a SSD by the [https://ata.wiki.kernel.org/index.php/ATA_Secure_Erase ATA Security Erase] command: | * To wipe a SSD by the [https://ata.wiki.kernel.org/index.php/ATA_Secure_Erase ATA Security Erase] command: | ||
#Make sure the drive is not frozen | #Make sure the drive is not frozen, support "enhanced erase" and <code>hdparm</code> prints "XXXmin for SECURITY ERASE UNIT": | ||
#:<code># hdparm -I /dev/sdX | #:<code># hdparm -I /dev/sdX | ||
#:[...] | #:[...] | ||
| Line 24: | Line 24: | ||
#:: 3<span style="background:#ffff00">min for SECURITY ERASE UNIT</span>. 3min for ENHANCED SECURITY ERASE UNIT. | #:: 3<span style="background:#ffff00">min for SECURITY ERASE UNIT</span>. 3min for ENHANCED SECURITY ERASE UNIT. | ||
#:[...]</code> | #:[...]</code> | ||
#Set a user password (this password will be cleared on the next step, so the exact choice does not matter): | #Set a user password (this password will be cleared on the next step, so the exact choice does not matter): | ||
#:<code># hdparm --user-master u --security-set-pass foo /dev/sdX</code> | #:<code># hdparm --user-master u --security-set-pass foo /dev/sdX</code> | ||
Revision as of 15:39, 20 September 2014
- To wipe an HDD by writing zeros to it:
# dd if=/dev/zero of=/dev/sdX iflag=nocache oflag=direct bs=4M
- The average speed is above 100 MB/s, so 1 TB takes about 2-3 hours.
- To print transfer statistics (to stderr):
# killall -USR1 dd
- To wipe a SSD by the ATA Security Erase command:
- Make sure the drive is not frozen, support "enhanced erase" and
hdparmprints "XXXmin for SECURITY ERASE UNIT":# hdparm -I /dev/sdX- [...]
- Security:
- Master password revision code = 65534
- supported
- not enabled
- not locked
- not frozen
- not expired: security count
- supported: enhanced erase
- 3min for SECURITY ERASE UNIT. 3min for ENHANCED SECURITY ERASE UNIT.
[...]
- Set a user password (this password will be cleared on the next step, so the exact choice does not matter):
# hdparm --user-master u --security-set-pass foo /dev/sdX
- Issue the ATA Secure Erase command:
# hdparm hdparm --user-master u --security-erase foo /dev/sdX