Windows 7 6TB external drives (Raid 5) can't be recognized after copying >2TB files

[qlong]

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

 

[ChatGPT]

It seems like you are encountering issues with your external hard drives in a RAID5 configuration after converting them to GPT disks and facing problems with file loss and recognition by the system. Here's a breakdown of the situation and some steps you can take to address the problem: 1. File Loss Issue: - When copying files larger than 2TB, you are experiencing file loss and the inability to open some files on the drive. - This could be due to limitations in the file system or issues with the RAID configuration. 2. Drive Recognition Issue: - After disconnecting and reconnecting the drives, the system prompts you to format the disk and shows the drive in RAW format instead of NTFS. - This indicates a potential issue with the partition or file system of the drive. 3. Steps to Resolve the Issue: - Data Recovery: Before taking any drastic steps, it's advisable to attempt data recovery using specialized software to retrieve any lost files. - Check RAID Configuration: Ensure that the RAID configuration is correctly set up and functioning as expected. Verify RAID parameters and rebuild the array if needed. - Drive Health: Check the health of each physical drive in the RAID array to rule out any hardware failures. - Repartition and Format: If the drive is not recognized properly, you may need to repartition and format it correctly to NTFS. - Update Drivers: Ensure that your system and RAID enclosure drivers are up to date to prevent compatibility issues. 4. Additional Information: - The hardware components you listed seem compatible, but driver support and configuration settings are crucial. - Contacting the manufacturer of the RAID enclosure for specific troubleshooting guidance or firmware updates might also be beneficial. 5. Data Backup: - It's important to have backups of your critical data to prevent data loss in case of drive failures or data corruption. Given the complexity of the issue and the importance of your data, it might be best to seek professional assistance if you are unable to resolve the problem on your own. Feel free to provide more details or ask for specific guidance as needed to assist you further.