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ICS tools, such as ImageMasster product line, are not designed for data recovery... They don't retrieve data from bad sectors, can't preconfigure the drive under recovery so that it doesn't die during the imaging process, can't skip problematic sectors that take too long time to process, can't...

Here is the drive imaging device designed specifically for data recovery, i.e. to retrieve bad sectors, handle drive instability issues, such as occasional hang-ups or clicks, etc.: http://www.deepspar.com/products-ds-disk-imager.html. Software imaging tools will not be able to handle those...

Ptdd, if you mean to study hard drive design internals applicable to data recovery technology then unfortunately, you will not be able to find this information in public domain... :(. There are some companies that teach classes on this topic though. Try to search for "data recovery training".

Just wanted to add in case if it's interesting for someone... Data from bad sectors can still be retrieved in many situations. For those of you who are interested in getting deeper into this subject there is a whitepaper that explain these processes in details...

PC-3000 became a standard tool in data recovery industry. Pretty much every data recovery company is using it nowaday. I've heard that there are some other tools exist, but it seems like just a few people are using them, and I am not familiar with other tools. However, as I mentioned to you...

In most of the cases when the heads are failed IBM drives make clicking noises. The drive's sound in this case looks more as a firmware corruption. The drive keeps trying to load firmware from system area (disk platters) a few times and each time fails to do that... BTW, for "ptdd": you are...

The drive firmware loacted in system area on the disk platters. You can read about the professional data recovery process here: http://www.deepspar.com/3d-data-recovery-overview.html. They have tools to diagnose the drive, fix drive's firmware issues, retrieve data from bad sectors, etc... All...

You can read here what is professional data recovery process about: http://www.deepspar.com/3d-data-recovery-overview.html. You will also find there all required tools to diagnose the drive, fix drive's firmware issues, retrieve data from bad sectors, etc... These tools became standard nowadays...