Hi all, this my first post in this great techno-home!

The PCB of my 1T WD Caviar Black WD1002FAEX (mfgd date 13 OCT 2010), containing valious data to me, got fried on a power surge after barely a month from buy it. I call dealer, friend mine. He sent me another disk with a so close contiguous manufacturing date, 14 OCT 2010, the DCM from both hd also was similar, HANNTJCBB and HANNTJCAB respectively. After all the saints pray, I replaced the damaged PCB with donor, no ROM transfer. With an almost mystical expectative, I put my frankestein disk in PC, it was recognized in BIOS, first promising wnner round! then boot OS, Windows XP scandsk pop up over my HD, oops! there was a large string of fixes. Almost no nails, I kept waiting OS... splash screen...and..voila! my disk letter unit was there in My PC! near one hour checking data, all data right!.
HD Sentinel: Power on time: 32 days,17 hours, estimated remaining lfetime: more than 1000 days. S.M.A.R.T 100% performance/health. As I said, The disc passed all tests.
I was lucky caused by close mfg date meant similar (and working) firmware? does that mean I can be calm? Or I have to be attent to some possible issue happen next? how I can be sure everything is right?

While he vast majority of the time this is not the case, every once in a while you get one that is close enough to work. Got lucky.

I'm sure I don't have to tell you after this, but time to make and keep a backup

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You don't have to backup all of your files, just the ones you want to keep.

You were very lucky that the firmware matched and allowed you to recover your data.

However, the PCB that you are using is not optimally tuned for your drive. I wouldn't use it to store my valuable data! I'd return your drive with the original bad board for warranty replacement.

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http://www.datasaversllc.com

Thanks, absolutly agree, in fact, part of data is hold safe from previous backup, unfortunately not the same for important recording sessions takes (I am musician and audio eng.) from two days before. The first I did now was a full backup.