Sanitization not only removes the map but also erases all blocks that have been written on.
Secure erase will delete the mapping table for the drive but will not wipe all of the blocks that have been written on. (Note: shredding the silicon might damage your shredder machine.) The latter method is final, however, in that the drive is permanently destroyed and cannot be re-used as if fresh out of the box as can be done with other methods. Another method to sanitize a drive is to physically destroy the hard drive platter with a hammer or destroy the silicon chip of the SSD by shredding it or otherwise physically destroying it. Block Erase sets the voltage level on each storage element to a significantly higher level than the standard operating voltage and then drops it to ground. One of the reasons it’s a problem to overwrite NAND flash SSDs is that the system has to issue an ERASE command first before it can perform a WRITE command to the same physical location.Īnother way to sanitize NAND flash-based SSD is by using Block Erase on every element in the flash array. Overwriting data doesn’t work well with SSDs because SSDs don’t work like traditional HDDs. Another well-known sanitization operation is to overwrite the existing data with something else. Once the encryption key is changed, the data becomes inaccessible or no longer understandable. There are a few methods for permanently destroying data on a drive: A Crypto Erase applies to self-encrypting drives that allow you to change the media encryption key. Figure 1: Erasing or sanitizing an SSD should only take a minute or less. The term “sanitize” describes a process where data is irretrievably removed from a storage device such that it is not possible to forensically (or otherwise) reconstruct it. Erasure methods are very different between the two storage technologies. Methods to sanitize HDDs often do not work on SSDs. However, for most SSDs no overwrite command is available for sanitizing the drive. HDDs can be overwritten multiple times, which takes some time to do. However, permanently erasing SSDs is not the same as for HDDs. (Addressing can get cumbersome and start to get slow if you start to have addresses greater than 32-bits long). SSDs are generally faster to access if they are not too large.
New personal computers are migrating from standard Hard Disk Drives (HDDs) to Solid State Drives (SSDs). Discarded drives have been found with everything from financial and medical data, email, and even pornography on them. A drive that’s returned, repurposed, or discarded can have personal or confidential data on it. When you’re done with a data storage drive, it’s nice to make sure that all of the data is scrubbed from it.
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