I have Startech SATADUP11, RapidSpar, DeepSpar, MRT, PC3000 and have used ddrescue and hddsuperclone from time to time. I'd be happy to answer your questions about each specific option. A quick summary:
ddrescue - basic drive cloning software in linux, handling bad sectors. Can be annoying to use if the drive is unstable and it is extremely easy to accidentally clone backwards (from destination to source). Doesn't have any features to target files.
hddsuperclone - a huge improvement to ddrescue with some added features and a gui. But, still has issues with unstable drives and still a risk to accidentally clone backwards. Doesn't have any features to target files.
SATADUP11 - a 1:1 hardware imager that can be set to stop on any number of read errors or allow unlimited. Can be set to clone system files and partitions (by bitmap) targeting only the sectors that have data in them. Unfortunately, it doesn't have a log, so if you restart, you start from the beginning. You can only image one way and the source and destination are marked. So, it is less likely that you can image backwards, but still possible if the drives are the same capactity.
RapidSpar - a good rounded tool, designed more for computer shops who want to provide better data recovery and drive diagnosis than what can be done with the previous 3 options. This tool as the ability to go so far as to repower the source drive, should it go unresponsive. The support on the RapidSpar forums is very handy in providing assistance on how to do pretty much anything you ask, providing that you have the equipment and tools to do them. Being able to load up the file structure and target a specific file or sub-folder to be recovered not only speeds up the recovery, but may increase the chances of recovery, if those are the key files to be recovered. The thing that is really good about this product is that the DeepSpar team is really good at listening to client needs and providing fast fixes and updates. If you can afford to, I'd recommend getting the forensic add-on to allow you to mount drives through the imager, but it isn't necessary. It is also a nice that the unit is portable and can run as a stand alone imager too.
DeepSpar 4 - this is the powerhouse of drive cloning. with the network add-on, it has so much more control over the imaging process than RapidSpar. It is a great tool to have when you have a drive in really rough condition, you can setup multiple pass algorithms to dig in and get as many sectors from the drive copied to the clone. As with RapidSpar, DeepSpar is constantly updating and adding new features to make these tools even more powerful for drive imaging.
MRT Ultra - the big selling point for MRT, IMHO, is the low up-front costs for 4 imaging channels. You need only pay to charge it for a month as you need it. Got no recovery jobs this month? Then don't waste your money on it. Although MRT likes to think of themselves as a competitor to PC3000, I see them as a cheap imager that has some features of DeepSpar and PC3000, but lacks some functionality and control I crave. The software is buggy and the support isn't great. The software can handle more firmware issues than RapidSpar, but it is nowhere close to PC3000. If you are wishing for a gateway system to PC3000, this might be a good fit, as it allows you the chance to learn more about hard drives and their firmware. But, I'd probably buy it in tandem with a RapidSpar, as it isn't plug and play and you will need some time to figure things out. I guess it would depend on how fast a learner you are.
PC3000 - what can I say, this is the tool that almost every professional data recovery lab has to handle most of the complex cases. The imaging in DE is not as powerful as DeepSpar in some ways, yet there are many cases where a drive will only detect and read via the PC3000 utility, meaning that the only option to clone the drive is through DE.
There are other tools out there that others have mentioned, such as sediv and dolphin. I've never used those tools or even saw them in action. I feel it best to only comment on what I do know (or what I think I know) and not on what I don't.
_________________ Luke RAID Data Recovery
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