|>> So after reading that 2GB was enough to get rid of paging file <<|
Where did you read that. Wherever it was you were misinformed. Even with max memory Windows still benefits from a paging file and it should never be turned of completely.
>> When I removed the old drive windows wouldn't boot. <<
That is to be expected. Not only will it not boot but once you break a RAID 0 array to stand a very good chance if losing all your data.
You appear to be assuming that your RAID is functioning like RAID 1 were data is duplicated on both drives. With RAID 0 it isn't, it is split between both drives and files will be fragmented between the two drives. Recovering these fragments in the event of failure is nigh on impossible.
What do you mean by repartition of file? Thats a new one to me.
If the RAID 0 array is corrupted your only option will be to reformat again and start from scratch, only this time get rid of RAID 0. Use RAID 1 if you want redundancy.
The long and the short of it is that RAID 0 should be avoided. It gives no redundancy despite its name but is supposed to speed up disk access which it only does in very limited circumstances. In short RAID 0 is little more than a disaster waiting to happen.