I'm not an expert, but I doubt whether "regular" SCSI (or FC) controller allow you to read track "neighbourhood" or - int other words - adjust head position. Nevermind. After you read this data you still have problem: what bits are set on because of previous recording, and what are because of latest recording, what because of pre-previous, etc. It is extremely hard to get any information from the string of bits, because of CRC (or other) coding, RAID-x implementation, emulation of CKD, EBCDIC translation, etc. Seems like 100000 elements puzzle with picture of dark night sky. All the bits are in the same colour <g>.
Radoslaw, I agree with you (and your English is fine). Although experts on disk technology have told us that it is possible to recover previous contents of blocks on a FBA disk with the proper diagnostic equipment, I believe that it is extremely unlikely that usable data can be recovered. As you say, there will be missing (unrecoverable) data, format issues, etc, not to mention interpretation of the data if it is not in nice simple EBCDIC (binary and packed data). Although some intelligence agencies might be willing to put in the effort to recover fragmentary data from such disks, I doubt that corporate espionage or hackers would do so.
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