No SATA is not the same as RAID. SATA,IDE or SCSIare the drives interface.How they connect and communicate with the motherboard etc..
RAID is a configuration of the drives, so for example you have 2x 100GBSATA drives in a RAID 0 configuration (striped). This means they are logically seen asone drive,so the PC thinks you haveone drive at 200GB, even though physically you havetwo drives. There is no fault tolerance with this though so ifone drive fails you could lose everything. A program / operating system could spanboth drives.
Another common option is RAID 1 (Mirrored) with this configuration your PC will see your 2x 100GB SATA drives as1 x 100GB SATA drive, but it will copy all data onto the second drive. This option gives a backup and fault tolerance. So if one drives fail you can still carry on working. You will then be able to replace the failed drive and rebuild the mirror.
Both options will give you a performance increase as well as both disks can be read/written too at he same time.
There are many other levels of RAID which will give you varying performance boosts and fault tolerance depending on the number of drives you have in your machine.
I would recommend reading up on the subject before you make your choice but i hope this clarifies a few points for you.
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