ProSoft Data Rescue 3
Posted 12 July 2010 - 06:33 AM
Posted 12 July 2010 - 07:11 AM
Posted 12 July 2010 - 09:08 AM
File Salvage as able to recover 3700 CR2 and TIFF files after a 23 hour scan.
Posted 12 July 2010 - 09:43 AM
Posted 12 July 2010 - 10:17 AM
Posted 12 July 2010 - 09:22 PM
A real-world example: I recently had a colleague whose single laptop drive failed (and who didn't have a backup strategy). I used both DiskWarrior and Data Rescue to make sure he had everything on the drive. DiskWarrior was able to (relatively) quickly rebuild the directory and recover his files, in folders and with names just like he had them arranged. There weren't any system files, program graphics, etc. Data Rescue recovered the files as well, but took much longer, salvaged a lot of meaningless files, and put them all in numbered folders, often with numbers instead of names. Scattered amongst an astonishing number of meaningless cache files, logs, program graphics, etc. Sorting through these sorts of files on a modern drive to find useful files is a daunting task.
I compared it to a tornado hitting a library. Data Rescue will find every page of every book that's scattered around, but often won't be able to put the books back together. A program like Disk Warrior will start with salvaging the card catalog (remember those?), and as it finds pages, it uses the card catalog to put them back in the books, resulting in a room full of ordered books instead of a mountain of loose pages. Plus it's much (4x or more) faster.
Both have their place, and it's worth having both at hand. But start with software like Disk Warrior, and use Data Rescue as a last resort. The $100 for Disk Warrior is well spent since it will save you untold hours sorting and assembling everything. In the story cited above, my colleague never touched the Data Rescue files... everything he needed was in the Disk Warrior files, named and in folders like he left them. And he now has a backup drive (the best solution of all... backups and archives... but this wisdom comes to most only after a dramatic event like the failure of a drive).
btw, if the drive has a significant mechanical error (rare), you'll have no choice but to send the disk off to somewhere like DriveSavers, which will cost thousands. But it's well worth the time and money to try Disk Warrior and Data Rescue first (roughly $100 each).
Posted 15 July 2010 - 02:21 PM
My name is David and I'm with Prosoft Customer Support.
There could be a few reasons for this, as explained below.
When you do a Deep scan, Data Rescue uses two different algorithms to locate files. These methods will often locate many of the same files twice – once under the Found Files folder and again under the Reconstructed Files folder. So if you elect to recover everything, it will often be the case that the total space required exceeds the original media size.
The second reason why the found files may total more than expected is the possibility of anomalously (and incorrectly) large files. In the course of scanning the media, Data Rescue will often come across bad files and catalog entries. Data Rescue is able to filter out the vast majority of these bad entries, but not all of them. Occasionally a few of these may show up in the recovery list with incorrect and large sizes. If you suspect this may be the case, you can easily find these large files by searching for files greater than a certain size using the Edit Find menu item. A useful technique to eliminate these from the recovery is: first mark everything by clicking the checkbox for the top level folders, then search for and uncheck the large files which appear to be bogus.
A third possible reason is if the scanned drive makes heavy use of hard linked files, such as a Time Machine backup drive. Hard linked files are used by Time Machine to store many copies of the same file with the same content, without duplicating the contents. The current version of Data Rescue 3 sees and recovers such files as individual files and does not share space among the files when recovering. For example, if there are 20 hard links to a 1MB file on the original disk, and you recover all 20 links, the recovered files will each take 1MB, or a total of 20MB. The best approach for this case is to select a single set of files to recover, such as the latest Time Machine backup folders rather than attempting to recover everything.
Feel free to contact our Support department at 925-426-6306 between 7AM and 5PM PST Monday to Friday if you have any further questions.
Posted 15 July 2010 - 02:27 PM
My name is David from Prosoft Engineering.
Regarding the issue of file names - it depends upon where in the scan results you look for files and also depends upon the scan type that was used, and what initially happened to the files or drive that required the use of Data Rescue 3. In the following scenario we are going to assume the drive is corrupted and no longer mounts, but no files had been trashed. The Deep Scan method is what would commonly be used in this scenario.
After a Deep Scan of the drive, there are two parts to the scan results. First is listed the Reconstructed files. This is where Data Rescue 3 would sort out files that are no longer referenced in the file catalog, and thus found by their content. Such files would be previously deleted files, or files that have been completely de-referenced in the file catalog due to corruption. Data Rescue 3 organizes the files here by their content. When files are emptied from the trash as is the most common scenario requiring recovery from Reconstructed files, all of the information pertaining to the file ( filename, parent directory and all associated metadata) is removed from the file catalog by the Mac Operating System and permanently lost. At this point no software can recover the original filenames. Data Rescue 3 reconstructs these files from known patterns and sorts them out according to their file type. We place the Reconstructed files folder in the scan results after a Deep Scan so that if any file catalog corruption exists, files can still be recovered by their content if necessary.
Certain file types may contain embedded data that can be useful as a filename, but most do not.
The second part of the scan results is the Found Files. Inside Found Files is where you would look to find files sorted by the original file catalog locations. All file names, paths, parent and sub-folder names are represented here as best as can be found in the file catalog. There is a sub-section here for Orphaned files, files that have lost their parent folder information due again to file catalog corruption on the drive.
We encourage our customers to contact our Support department at 925-426-6306, or via email to firstname.lastname@example.org if they have any questions. Additionally a trouble ticket can be opened by our customers from the Support page on our website:
Our hours for support are listed on our website - we're open for Support from 7AM to 5PM PST Monday through Friday.
Please don't hesitate to contact us if you have any questions.
Posted 20 July 2010 - 10:45 AM
Posted 16 November 2010 - 12:51 PM
I've also heard of Disk Drill (http://www.cleverfiles.com/) release (seems like it is in beta now) - do you have its testing in plans? Looks interesting as well.