I thought I would share what I have done to 4 TS-Live 2.0s, 1 TS-Live 1.0 and a TS-Pro II.
First upgrade to the latest firmware...
I used 4x Western Digital Caviar Green WD10EACS 1TB SATA and they are quiet and
fast. Some may argue to use the RE2 RAID Editions.
1. IMPORTANT: BACKUP ALL DATA from TS to external drives or another TS. Another
TS will be faster.
2. Delete all Data on TS (I deleted the shared folders)
3. Delete Raid Array
4. Turn off TS
5. Replace 2nd HD with new one (1TB)
6. Reboot TS
7. Format the new HD
8. Repeat Step 4 to 7 for the drives 3,4 and 1.
9. Restructure RAID array (RAID 0 will be pretty quick, RAID 5 or 10 will take
overnight. I never tried RAID 1)
10. Create new share folders and copy the data from the external drives (or 2nd
TS) back to your upgraded TS.
Let's all pray for a Sleep Mode in the upcoming Firmware.