I suspect you may be in some difficulty. Click of death usually came about when the drive lost either its first track where the boot sector, partition table etc reside, or the service area in drives that loaded firmware from the platter (or both). Your drive needing (and benefiting from) a platter swap suggests to me that a head was also damaged in a head crash that, either at that time or when the damaged head tried to read the first track, tore up the first track on the disc. That would cause the drive to appear to need initialization, as there would be no boot sector or file system. Apart from the fact that you don't want to initialize the drive, thus overwriting the data content, if Track 0 is damaged the initialization will fail. However the drive seeming to now behave sensibly and having correct parameters suggests it's not an issue involving firmware held on the platter.
If this is the scenario, recovery will be uncertain. More advanced software may have success, but if the file system is not NTFS, there will probably be less chance since it's likely the FAT is damaged. With NTFS the situation could be better, since the MFT is not at the beginning of the drive, and unless there is damage to the surface in several locations, may have survived.
As a last resort, what your money would get you with the professional recovery service would be facilities like being able to directly access the drive's controller to attempt to read every Logical Block Address on the drive, and then walk any recovered data searching for coherent text, file headers, the MFT etc. This way the data can be examined for as long as required without having to run the damaged drive, with the attendant risk of causing more harm, especially now it has been opened in non clean room conditions.
DCM I believe is the Drive Configuration Matrix, but its significance isn't clear, as people report swaps between drives with the same DCM not working, but sometimes a swap when the DCMs are different can work, or partially succeed.
Edited by Platypus, 05 April 2013 - 07:26 AM.