Drive, WD1600JB, became unrecognized by computer system (XP Professional). Driver can not be read by any other computer. I believe that from what repair shop tells me, the drive servo drive has failed. An attempt was made to replace the circute board and move IC chip from old to new board. This did not change the ability to read the data.
If this is the case, it is likely that the data is intact on the platters. The question becomes, how can I recover the data from this drive.
One suggestion was to purchase another identical HD and swap the platters to be able to read the data. Of course not being a tech or having necessary tools and environment, I am reluctant to do this.