Hi,

like wpte said, flash drives are going to wear-out after a given amount of time. Although the performance gain is impressive (mostly due to access-times), you will see strange errors after 4-5-6 months which you can't explain.

if you have so much storage (1tb) you absolutely need a swap partition for the memory (otherwise the asus can not address all the space).

If you don't need 'hardware/software' raid settings, put a swap, /opt and data partition on the 120gb. also put a data partition on the 1 tb, and use a scheduled script (cron) to duplicate important data from the 120gb to the 1tb. this way you'll have a second accessible backup.