The best at that is the WD7500AAKS Western Digital Caviar (and its sister drive with 24/7 rating, the WD7500AYYS.) If you are capturing video data directly to an external drive using Final Cut Pro or such, the drive with the fastest sustained speed is the Samsung Spinpoint F1. Second fastest is the Seagate 7200.11.

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Any of the above will do the job. Keep in mind no matter what you do, HDD will failed eventually. So for safe keeping you should have 2 set of USB HDD. This is good but a bit of inconvenient, cuz you have a 4x set of library and need to swap out when needed. Or in my usage i have a RAID5 driver-less - a combine of 5x drives 2TB, that hot plug into ANY Windows's eSATA/USB3.0/2.0 port to see my libray. Of course this is not a perfect solution, a back up still needed, but certainly help my to keep my media file, in an event a HDD fail. Cheap computer case - you can pick up at local store for less than $20.00 Add a driver-less hardware RAID card eSATA/USB Install 5x 4TB drives - the RAID support 48bit LBA, that means it can go up to 64TB per port Within minute you will have 16TB - high availability.

I'd go with the Seagate Backup Plus because of A. The price ($170) B. Comes with software that does automatic Backups If you dont need automatic backups, go with the cheapest (Seagate Expansion) Im a noob with cpu things. What is a back up exactly?

It back up inside the cpu or in the external hdd? If it back up inside cpu, it takes howmutch space on the cpu to back up 4tb external hdd? Can i buy a 5th external hdd just to back up the 4 HDD loaded with movie? If a HDD die, is it still possible to recover information? Thank you for help.

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