Data Storage Devices

Charles Fulton
Special 2007

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There are many considerations for storage when you're dealing with video, especially if you're storing HD video. You need room on a hard drive for capturing footage. You need a scratch drive for rendering effects. You need an optical drive for outputting your projects. You might need an archive system, too.

With all the need for storage, where do you start? Well, by reading this sentence, you've taken the first step in realizing that storage is a vital part of your video workflow. We'll try to take you through the rest of the way.

Your editing computer has at least one hard drive. This drive is used to boot your computer and also to store your applications. You could capture video to this drive, but the better way is to capture to a different hard drive. (A lot goes on behind the scenes on your computer, all requiring a lot of hard drive writes. These writes accumulate and degrade the performance of the drive for anything else you need to do with it.) You can add another drive fairly easily if you know what interface your machine uses.

The most common interfaces that data moves through on its way to or from storage media (on the type of computer system most of us use) are ATA, SATA, eSATA, USB 2.0 and FireWire. ATA and SATA are internal interfaces. eSATA is the external version of SATA - the primary difference is the use of a different connector that is more tolerant of abuse. All of the speed that SATA offers is duplicated with eSATA.

FireWire and USB 2.0 are popular for their ease of use and portability, though neither has the raw performance of ATA, SATA or eSATA. While FireWire and USB 2.0 are both fast enough to handle DV streams, the performance hit will rear its ugly head when you're rendering effects or your final project. That said, if you find yourself needing more hard drive space right now, and there's no eSATA port and you don't have room for another internal drive inside your system, it's hard to go wrong with a FireWire or USB 2.0 drive.

There are also some benefits to using a NAS, or network-attached storage device. If you have a gigabit Ethernet switch between this device and the computers you edit with, you can get some remarkably high data transfer rates. The added benefit is that you can access the same files from any computer on your network.

What should you look for on a hard drive? Capacity is the first thing that usually comes to mind, naturally. The sweet spot for price vs. capacity (lowest cost per gigabyte) is moving toward 500GB drives, now that the big manufacturers are shipping 750GB and 1TB drives. You'll also see a reference to cache size - 8MB is most common, but anything above 2MB is generally fine.

Drives with big caches give you a speed advantage for dealing with a lot of small files, not a handful of really big files. Spindle speeds of 7,200rpm are the most common you'll come across, for good reason: they're fast and they're a good value. While you can get 10,000 and 15,000rpm hard drives, they're pricey and they run hot. But if you need to render something really fast, this is one potential place where you could get a speed advantage. We think the best place to implement a drive with a spindle speed above 7,200rpm is as a scratch drive, though we've seen a few computers that have hard drives with ultra-high spindle speeds installed as boot drives.

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