As USB thumb drives and memory cards get larger and cheaper, it's getting easier to trust much more of your data to them. It's also much easier to mistakenly erase data or have them hiccup on you. And if you're in the habit of holding on to that data for too long -- for example, not transferring photos from your camera's memory card -- disaster is almost guaranteed to strike at some point. What happens then?
While there's no end of data recovery software packages out there, most of them are primarily designed to reclaim data from system drives. In this roundup, I look at the following six packages in terms of how well they recover data from mobile storage such as flash drives and memory cards: CardRecovery, PhotoRec, Recover My Files, Recuva, Remo Recover and Undelete 360.
Mobile storage devices can pose their own challenges for data recovery tools. A damaged device with no proper partition data might not mount correctly, making it impossible to use with tools that require a drive letter. Memory cards used in cameras can have data stored on them in oddball formats, such as Canon's CR2 raw-image format, a custom variant of the TIF format.
How we tested
For testing, I used two storage devices: a Transcend 8GB SDHC card (Class 6) and an 8GB Kingston DataTraveler flash drive. Both were formatted as FAT32 and loaded with 5.8GB of files, a mixture of image files in multiple formats (JPG, GIF, PNG, Photoshop), audio files (variable bit-rate MP3), Microsoft Office documents, ZIP archives and PDF files.
I tested them using the Windows versions of these recovery apps. (Some of these products also offer versions for other platforms, which I didn't test; these are noted at the top of each review.) Tests involved selectively erasing and recovering files, and attempting to recover all files after a quick format (one where only the directory information is erased, not each block on the disk).
OS: Windows 98 and later. (CardRescue available for Mac OS X)
CardRecovery is the most focused of the applications reviewed here: It exists mainly to recover files from memory cards used in cameras. The only file types it works with are JPG and RAW-format image files, and video and audio files (e.g., AVI, MPG, MOV, MP3, WAV). It will not search for documents, archive formats, some image formats (such as Photoshop or PNG) and other day-to-day file types.
On the plus side, CardRecovery offered the best detection of CR2 files I found. In addition, its wizard interface made the recovery process quite easy. To begin a scan, just enter a drive letter, a camera brand (optional) and/or a file type (also optional), and a destination folder in which to save the recovered files.
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