In short, the major differences between the media types are:
- Electronic vs. magnetic writes
- Static vs. dynamic storage locations
Most established data recovery specialists have had years to perfect their data recovery techniques for mechanical drives and some have very sophisticated methods for dealing with RAID controllers. Parts can be replaced and media damage can be overcome to get access to the raw data (basically creating an image of the data on the physical disk). Once the raw data is recovered, software can be used to virtualize the RAID controller. The data recovery specialist can virtually reassemble the array, then the logical volume can be rebuilt, errors can be corrected and the data can be recovered. Another difference to note is that individual disk failures on mechanical drives are often predictable and data loss can be prevented or minimized.
SSD is a newer technology and very few data recovery specialists have the ability to handle the RAID and the SSD layers in order to put the data together in the event of a failure. In some cases, parts can be replaced to overcome failures. To overcome media damage, however, the NAND chips often need to be removed and imaged independently. This requires specialized tools and software and usually a significant investment in R&D, as data is stored in a different way on each drive. The raw data bits then need to be reassembled into a usable format, which is much more challenging than simply imaging the disk by overcoming physical/electrical issues or media corruption like you would find in mechanical drives. Once that is complete, the RAID is then reassembled, the logical volume is rebuilt, any damage is repaired and then the data is recovered. Individual disk failures are often unpredictable and special care needs to be taken to prevent data loss.
In conclusion, when evaluating solid state against traditional hard disks, make sure to take into consideration the possibility of data loss and the need for data recovery. It could mean the difference between meeting the requirements for enterprise applications and disaster. For recovery information about specific RAID controllers or specific drives and their recoverability before you purchase them, contact your local data recovery specialist.Reference: http://thedatarecoveryblog.com/2012/11/20/ssd-vs-hdd-the-missing-considerations-2/