4x2TB external drives (Raid 5) can't be recognized after copying >=2TB

I have 4x2TB external hard drives in a raid5 configuration, and first I converted it to GPT disk using Disk Magagement in Windows 7. It shows basic disk, NTFS, 1 partition, 5.40TB, which is normal. It worked 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 but to 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

2. 4x2TB hard drives
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
3 answers Last reply
More about 4x2tb external drives raid recognized copying
  1. Have you tried accessing it with Windows 7 64-bit edition?
  2. That's I was going to try, although I think it shouldn't be...

    But I just find a clue...

    People encountered the similar ploblem, they said that may beacuse the "mobo esata" doesn't support >2TB limit. That's worth a shot.

    I'll try usb copy first, and wish me luck :D

    Thank you!
  3. What I see in Mediasonic's documentation for this device it states "When the total capacity is more than 2TB, OS of 64bit is required."
Ask a new question

Read More

NAS / RAID Storage Product