I had more or less the same problem…
bought TWO WD30EZRX, both made october 2012 same firmware and model number.
Formatted via WIN 7 in GPT in NTFS, via SATA cable, IN THE SAME EXACTLY WAY.
Inside the popcorn C-200 ( into the “hot swap bay” )one works, the second is not recognized!!!
( I checked and compared the two disk with windows 7; for CrystaldiskInfo under WIN 7 both are OK, SMART are OK, ALL is the SAME!!!)
Whe I insert the NOT working HD into C-200, appear a name SATA_DISK_A1_1. the good one has correct name SATA_DISK_A1
After few test NOTHING to do!!!
The day after one HD is completely DIED!! connected via SATA as second HD, WIN7 doesn’t START. The BIOS find the HD but WIN 7 stops before to start.
Via USB the HD is not find.
With DLGDIAG5.2 in DOS, in low level format deep analysys “TOO MANY ERRORS FIND…”
The HD has worked for 20 hours, I lost 3TB of data. WD replace with a RECERTIFICED DRIVER WITH ONLY 3 MOUNTHS OF GUARANTEE REMAIN TIME!!
