Apple TV Unboxing

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I’m in love with my hard drives. They really are miraculous devices, storing billions of bytes and copying that data to and from drive to drive at amazing speeds. I realize that the world of external storage is pretty vast, with lots of names and terms and numbers, and thought it would be good to do a quickly summarize the differences between external drives.

The first distinction I make between external drives is their physical size. The case around the actual drive may vary in size but there are only two sizes of hard drives–2.5-inch laptop drives and 3.5-inch desktop drives. Desktop drives require more power than can be supplied via USB or FireWire, and so they are considered “desktop” hard drives because you need to plug them into power separately.

Laptop drives often can run off USB power supplied by a USB port, so they are considered more portable. Just like comparing laptops and desktops, you will generally get more performance and space out of a desktop drive than you would from a laptop drive.

If you ever work with large amounts of video or want to play media off of an external drive, then a faster RPM (revolutions per minute) is worth buying. If you are just trying to keep your files backed up, then a lower RPM drive will work fine. The two specifications of drive speeds on the consumer market right now are 5400 and 7200 RPM.

The third thing to check is the connection type of the external drive. Most drives use only USB, but some drives offer FireWire 400, 800, and/or eSATA. For general backup, USB is perfect because it’s fast, reliable, and can be plugged into almost any computer made in the last 5-10 years.

FireWire is a connection also known as IEEE 1394. As anyone who works with video knows, FireWire is often required to download video from a camcorder or videocamera. Drives that have FireWire are generally more professionally geared because FireWire is a lower latency connection that makes transferring lots of small files faster than USB.

eSATA is a very fast data connection but does not supply power. eSata is the fastest type of connection commonly seen in external drives, but Apple does not build this port into its computers at this time.

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