keep pt database in internal or external hd?

[fire_fly]

Hi, I just got a 160 gig external hd. For speed, should i keep my pt database on the internal or external, or does it not make a difference.

Both are 7200 rpm.

External is 480 Mbits/s transfer rate (usb 2.0), says memory cache is "2MB or greater," whatever the hell that means.

So should I keep and use this drive or would an internal (maybe 10,000 rpm?) be way faster. Thanks.