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[TGD] Report: SSDs "difficult" to securely erase

post #1 of 78
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Quote:
A team of researchers from the University of California at San Diego have concluded that it is difficult to "securely" erase data stored on solid state drives (SSDs). For example, ATA and SCSI command set features for securely destroying data on SSDs were available on 8 of the 12 drives tested and only successful on 4.


And while repeatedly overwriting an entire disk with multiple repetitions successfully destroyed data, the SSD Firmware Translation Layer (FTL) made the process more complicated and time-consuming than on traditional hard disk drives.

Source


Uh oh....

=========================

Also in the news...

From ~ ZDNet: Mac fail: SSD security

Quote:
SSDs, Mac OS X and data security don’t mix. Not only does the standard file delete not delete files - which savvy readers already know, but even the Mac’s “Secure Erase Trash” function leaves 2/3rds of a file recoverable.

“Fake Erase” perhaps?

The SSD problem
Vendors have struggled to make flash SSDs look like disk drives even though the underlying media are very different. Hard drives associate a physical location with each logical block address (LBA). SSDs don’t.

And that’s the security problem.

Our secure file deletion tools assume that the data is stored in a set physical location. If the LBA is written to, the existing data at that LBA can be presumed to have been overwritten. (Bad block replacement is the big exception to that general rule.)

But on flash-based SSDs, the firmware that makes flash look like a disk - the flash translation layer (FTL) - is constantly changing the physical address of the data. When the OS issues an overwrite, the FTL overwrites only the most recent location the data - leaving older locations untouched.

Edited by _GTech - 2/21/11 at 4:47pm
The Rock
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post #2 of 78
yea but they are so small you can just burn it, or just smash it to pieces if you really need that data to be gone.
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post #3 of 78
1. Defrag until SSD dies.
2. ???
3. Profit
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post #4 of 78
I've seen this firsthand. The drive has to be in AHCI mode and even then, it's a crapshoot.
    
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post #5 of 78
lol @ (FTL)

if you really need to destroy the data a physical hammer works
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post #6 of 78
if anyone out there is having trouble erasing their SSD, just send it to cyberdruid. It will be carefully hung from a tree branch then some 12 ought buck shot should do the trick!
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post #7 of 78
Good thing I only have mine for my OS and games All the pr0n goes on the HDD which is easy to get rid of. Now once they start coming out with cheap 256Gb+ drives I might start to worry about this
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post #8 of 78
I don't get it... how is memory still read if it is overwritten? I mean, if I filled the entire SSD with pictures of a sunset, over top of whatever original data was there, what part of the drive is still retaining the original data?

I understand how data recovery is possible on magnetic storage, since the bit can be biased slightly and that bias can be read, I just don't understand how an SSD could have any bias towards previous writes.
post #9 of 78
Thread Starter 


You could always put them in the SSD NO Recovery Repository (The Ocean).....




I'm not too hip on computer forensics, but come one, who's gonna comb the ocean looking for your SSD?? lol...
Edited by _GTech - 2/21/11 at 2:41pm
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post #10 of 78
I know a sure fire way to delete the data.

Give me a blow torch and hammer.
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