RAID 0 has excellent write speeds as well as read speeds.
I wouldn't use RAID 0 if you're not backing up the data in some fashion, as any drive failure in the array will cause the entire array to crash. So, for each drive added, it adds another single point of failure.
In my data center, we only use RAID 0 for LUNs or partitions that handle temporary SQL or Oracle backups -- basically, data we can afford to lose. OSes are RAID 1, Databases are RAID 10, Logs are RAID 1, various file systems are RAID 5 or 50.
Personally, on my primary home PC, I just use the onboard Intel for a couple of RAID 1's. I've had drives fail in both arrays at various times, and the mirroring saved me a restore.
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