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Hi everyone ! I have a strange problem. I've just installed 10.9 on my AMD Athlon 64 x2 2.0 Ghz 2 GB DDR2 RAM. I have 2 SATA drives, one of 80 GB for OS X and another one of 500 GB for Windows 8.1 / Data. Everythings works fine but for an unknown reason, sometimes the second 500 GB drive suddendly disappear from my desktop saying Ejecting Error, try to disconnect the drive byâ€¦etc, just as if it was an USB external drive. System Profiler detects it as a SATA drive, the icons aren't yellow, there's just like any normal drive and most of time, I can read/write on them without problems. I did a Time Machine backup without issues. First I thought that it was a Kext conflict between SuperVIAATA.kext and IOAHCIBlockStorageInjector.kext or AHCI_3rdPartySata.kext but I tried to remove the two last of them and be able to boot fine (Removing SuperVIAATA.kext result as "still waiting for root device"). But the problem persist and I can't figure why ! The drive works fine on Windows and shows no errors, SMART state is reported as capable and OK and the 80 GB hosting OS X works fine as well. My desktop is a HP dc5750 with the latest BIOS (configure in Native IDE mode - no AHCI available) and beside this very anoying problem under OS X, it works fine. Any ideas ?