IBM 400GB SSD 2.5 IBM00-02054-MI5BBCTU PN 9970678 in Tray | eBay
These are STec S840 series (S840's I'm going to assume, the gen2 S842 is a 2013 part and these were available starting in 2011) eMLC with a rated endurance of 7.3PB for the 400GB size. They also made a "write intensive" (as if 7.3PB isn't write intensive enough) drive that's the same 512GB sized drive underprovisioned to 300GB for even more write endurance.
I ordered a batch of these out of curiosity, wear is like ~225TBW-440TBW over 3.5 years of a rated 7.3PB endurance. One bum drive out of 6, the only drive of the batch with a 2011 mfgr date the others are all 2013 parts. All drives had ~3-3.5Yrs run time, 3 with ~220TBW, 2 with ~440TBW, one (bad) with 2TBW that chucked out 1k Grown Defects before I interrupted the badblocks run.
Performance is alright, but not great given power consumption. They're around 25% slower than the Samsung 850 Pro's I had spare to run comparisons.
FWIW these do come formatted to 528 byte sector size, though the drive controller supports 512,520 and 528b sectors. I had a crack at reformatting using sg_format and failed but had success with ahouston/setblocksize
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