Hi, My friend's cannot access the data on his Seagate 4tb drive SRDOSDO formatted NTFS. When he plugs it in it takes 2-3 min to show up on the desktop. I plugged it into my Macbook(Yosemite 10.10.3) and a warning states computer cannot recognize the disk and it needs to be initialized. I think I ran Prosoft Data Rescue 3.2. deep scan overnight and got numerous errors stating that due to slow disk reads stating drive might be failing. I decided to clone the drive(recommended) to another external 5tb Seagate. I set energy saver to not turn off the laptop but am not sure if my computer's lock screen stopped the operation. After 10 hours I logged back on and the program seemed to have stalled in terms of progress bar was not changing(megabytes saved). I was thinking of running Steve Gibson's Spinrite but don't have a desktop to attach the drive to after removing the internal drive from the case(it's very difficult). I hear some weird noises when Prosoft was running. the strange thing is the drive will, at times, be recognized by Yosemite but I cannot copy the files over due to an error(displayed below). I managed to copy about 400mb of his family photos but that was it. I cannot seem to get the macbook to recognize the drive. Is there any program that might be able to rescurrect thisi drive. If not, can you suggest any other options? He can't afford Drivesavers. Thanks.