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USB 2.0 is much slower than SCSI/IDE/SATA, the standards for internal Hard Drives.
However, flash memory has a MTTF (mean time to failure) about ten times as long as a physical hard drive. They last FOREVER; there's no moving magnetic heads, like an ordinary drive. Samsung is actually working on a laptop which uses flash for the entire system drive. It's Shock resistant (500 Gs), has low low low energy consumption, and has an even lower rate of failure.
For speed, USB2.0 (and thumbdrive) is not the solution. An internal 7200 or 10k drive will be faster. For security and data integrity, a thumb drive isn't a bad choice. And look for Flash drives in the future.
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"I'm typing on a computer of science, which is being sent by science wires to a little science server where you can access it. I'm not typing on a computer of philosophy or religion or whatever other thing you think can be used to understand the universe because they're a poor substitute in the role of understanding the universe which exists independent from ourselves." - Willravel
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