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RAID0: 360GB. One drive failure kills the array and you lose everything. Do NOT use this level.
RAID1: 120GB. Can handle two drive failures without losing data. This will be best for data integrity because there's three straight copies of the data stored.
RAID5: 240GB. Can handle one drive failure without losing data.
Actual usable space will be lower because of SSD overprovisioning and file system tables.
Do you actually need SSD?
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