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Then, maybe cross your fingers and pray that there's no unencrypted data in areas that are not accessible by anything except the drive's controller. I believe all of that's been dealt with these days, so that it's most likely not a concern today, but as a general rule of thumb, if you want to be certain your data is gone, then encrypt it all before you erase. So, even if you passed a secure erase command to the controller, it wouldn't actually erase all the data that was in any region not accessible by the user. If I remember right, early Sandforce controllers were bad for this.
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In the early days of SSD's, somewhere like 4-6 years ago or even earlier, not all SSD manufacturers followed the ATA specs when they made their products. Hence the need to send that ATA secure erase command to the controller.īut wait, there's more. Using legacy format or those traditional "secure erase, multi pass" methods will not erase the data that's there. Just "failing", which makes it no longer accessible by a user. The issue with flash is that an SSD's controller can mark a cell as bad, even though technically it's still working. It's just 1's and 0's stored in memory cells.
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There is no magnetic media with flash storage. Something like PartedMagic is a decent tool to use, because its disk erase utility has the ability to send an ATA secure erase command directly to an SSD's controller, which (in theory) should erase everything. The more passes you make, and if you randomize the data too (not just do zeros), then the more "secure" the "erase" is.įlash storage is different. You write zeros over the sectors on those platters to overwrite any data that's there. Writing zeros needs to be done on magnetic media such as a drive with spinning platters.
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