Hi, I've got a macbook pro 13 inch 2010. A few years ago i replaced the normal HDD with a kingston SSD. so far so good. No crashes, sleep issues, hangs, etc ever that other people complain about because the kingston uses the same controller and memory chips as the air. Then recently i used an optibay to replace my optical drive with a 1tb HDD. Thats when trouble started. I have an HTPC i copy media files over to. I use a portable usb 2.0 drive to copy files from mac. then copy from USB drive to HTPC. well i noticed a bunch of times i'd copy files over and they would refuse to play. I thought it was a faulty usb drive, i formatteda bunch of times, tried NTFS as well as HFS. same problem. files arent corrupt all the time. but randomly. anyway i thought it was some basic flaw with the usb drive. So i tried a different usb drive. same thing. the file would play fine on my mac. then i'd copy it over, and it would be corrupt. not all the time. sometmes. i'd copy again sometimes it would be fine sometimes not. mind you not corrupt like the file showing up as 0 bytes like i've seen before, but it would show the full file size as normal. but it just wouldnt play. as unlikely as it was, i thought maybe it was an issue with video files or a file system corruption. i formatted my computer, started from the basics, from scratch, only restored my media files on a clean 10.8 install. the problem persists. recently i set my iphoto folder to this optibay drive. everything synced over from my iphone. and then 2 days later, the iphoto library just wont load. it there. the sysem structre is there. i can explore it via show package contents and see that the directories all exist. but it just wont load. this is driving me bonkers. i dont know if its an issue with the drive, maybe the usb controllers, the optibay, or what. if someone has an idea how i can test this please let me know.