i am building a new computer do i need to buy
http://www.amazon.com/ADATA-SX900-SATA-SandForce-ASX900S3-512GM-C/dp/B007M7XSOE
if i have a external hard drive.
http://www.amazon.com/ADATA-SX900-SATA-SandForce-ASX900S3-512GM-C/dp/B007M7XSOE
if i have a external hard drive.