If you’ve grown beyond the capacity of its internal hard drive, the ViewSonic PC mini 530/550 has USB 2.0 and high-speed eSATA interfaces for you to connect external storages. The speed of eSATA can reach as high as 3Gbps, six times faster than 480Mbps of USB 2.0; it’s best for moving or backing up massive media data. Faster interface means less transmission time and more for enjoyment.