6TB external drives (Raid 5) can't be recognized after copying >2TB files

#1
I have 4x2TB external hard drives in a raid5 configuration, I converted it to GPT disk using Disk Magagement in Windows 7. It showed basic disk, NTFS, 1 partition, 5.40TB, which is normal. It seemed pretty well at first. But after copying files >2TB to this drive, some files were lost and cann't open. Once I unplug it and repulg it again. The system can't recognize it, and popped up a message "You need to format the disk...". Of course I don't want to format it! I checked it using Disk Management, it showed the drive in SAW (NOT NTFS). I plugged it into another laptop with same system, still can't recognize.

Then, I had no choise and format it, copy again, and the same problem again!!! It takes me a whole week working on this. I still can't fix it, so... HELP ME!

Hardware:
1. Mediasonic HFR2-S3B PRORAID Box 4 Bay Raid Enclosure with USB 2.0, eSATA
Newegg.com - Mediasonic HFR2-S3B PRORAID Box 4 Bay Raid Enclosure with USB 2.0, eSATA & FireWire 400/800
http://mediasonicinc.com/store/contact_us.php?osCsid=44eadbdb4ddd7f8870a55894154e704f

2. 4x2TB hard drives
Western Digital Caviar Green WD20EADS 2TB 32MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive
Newegg.com - Western Digital Caviar Green WD20EADS 2TB 32MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive

3. PC: Lenovo Thinkpad T61

Software:
Windows 7 Ultimate x86
 


This website is not affiliated, owned, or endorsed by Microsoft Corporation. It is a member of the Microsoft Partner Program.