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| − | Solid State Drives pose a variety of interesting challenges for computer forensics. Most SSD devices are based on flash memory. Flash has two properties that complicate its use in computer storage systems:
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| − | # Unlike normal hard drives that can be written in a single pass, flash memory is arranged in pages that must first be erased before it can be written.
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| − | # Each flash page consists of multiple blocks. Typically block size is 512 bytes and page size is 2KiB, 4KiB, or larger.
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| − | # Each page can be erased and rewritten a limited number of times---typically 1000 to 10,000. (Hard drive sectors, in contrast, can be rewritten millions of times or more.)
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| − | To overcome these problems, SSD manufacturers have created a system for ''wear leveling''---that is, spreading the writes to flash out among different sectors. Wear leveling is typically done with a ''flash translation layer'' that maps ''logical sectors'' (or LBAs) to ''physical pages.'' Most FTLs are contained within the SSD device and are not accessible to end users.
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| − | ==Bibliography==
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| − | <bibtex>
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| − | @inproceedings{wei2011,
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| − | author = {Michael Wei and Laura M. Grupp and Frederick M. Spada and Steven Swanson},
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| − | title = {Reliably Erasing Data from Flash-Based Solid State Drives},
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| − | booktitle={FAST 2011},
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| − | year = 2011,
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| − | keywords = {erasing flash security ssd},
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| − | added-at = {2011-02-22T09:22:03.000+0100},
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| − | url={http://cseweb.ucsd.edu/users/m3wei/assets/pdf/FMS-2010-Secure-Erase.pdf},
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| − | biburl = {http://www.bibsonomy.org/bibtex/27c408ad559fc19f829717f485707a909/schmidt2}
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| − | }
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| − | </bibtex>
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| − | <bibtex>
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| − | @article{bell2011,
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| − | author="Graeme B. Bell and Richard Boddington",
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| − | title="Solid State Drives: The Beginning of the End for Current Practice in Digital Forensic Recovery?",
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| − | journal="Journal of Digital Forensics, Security and Law",
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| − | volume=5,
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| − | issue=3,
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| − | url={http://www.jdfsl.org/subscriptions/JDFSL-V5N3-Bell.pdf}
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| − | }
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| − | </bibtex>
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| − | ==Presentations==
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| − | * [http://www.snia.org/events/storage-developer2009/presentations/thursday/NealChristiansen_ATA_TrimDeleteNotification_Windows7.pdf ATA Trim / Delete Notification Support in Windows 7], Neal Christiansen, Storage Developer 2009
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| − | * [http://www.slideshare.net/digitalassembly/challenges-of-ssd-forensic-analysis Challenges of SSD Forensic Analysis], Digital Assembly.
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| − | * Scott Moulton, Shmoocon 20008, SSD drives vs. Hard Drives.
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| − | ** [http://www.youtube.com/watch?v=l4hbdZFWGog SSD Flash Hard Drives - Shmoocon 2008 - Part 1]
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| − | ** [http://www.youtube.com/watch?v=mglEnIPnzjo SSD Flash Hard Drives - Shmoocon 2008 - Part 2]
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| − | ** [http://www.youtube.com/watch?v=3psy_d-pyNg SSD Flash Hard Drives - Shmoocon 2008 - Part 3]
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| − | ** [http://www.youtube.com/watch?v=pKeZvhDd5c4 SSD Flash Hard Drives - Shmoocon 2008 - Part 4]
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| − | ** [http://www.youtube.com/watch?v=9XMBdDypSO4 SSD Flash Hard Drives - Shmoocon 2008 - Part 5]
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| − | ** [http://www.youtube.com/watch?v=LY36SWbfQg0 SSD Flash Hard Drives - Shmoocon 2008 - Part 6]
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| − | * [http://risky.biz/RB185 Risky Business #185], Peter Gutmann talks SSD forensics, March 4, 2011 (Radio Show)
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