There is a reason why there was no performance degradation: They ran the tests on "dirty" disk both times.
To clear an SSD, specials methods must be used: They are vendor specific but the SECURE ERASE command (ATA spec) will mostly do.
To clear an SSD, specials methods must be used: They are vendor specific but the SECURE ERASE command (ATA spec) will mostly do.
The method I use on my SSD when reinstalling:
hdparm --user-master u --security-set-pass 12345 /dev/sda
hdparm --user-master u --security-erase 12345 /dev/sdaIt is still blazingly fast, as the erase is:
1) Done in large chunks
2) Done in parallel (most SSDs have multiple dies)
3) Does not require data transfers out of the drive.