With SATA and EIDE port, WD Scorpio Blue Removable Hard Disk owns high function, low power and low temperature characteristic.
And for its spec, 5400RPM rotation speed, 8MB Buffer Size, 5.50 ms Average Latency, 12.0ms Read Seek Time, 2.0ms(average) Track-to Track Seek Time, moderate for user. And with 600Mbit/s(Max) Transfer Rate(Buffer to disk), particularily fast. And its just 0.22 pounds, not so heavy.
By the way, there are some specialized tech over it. The ShockGuard portect it not to be distrubed by the environemnt factor and oscillation. SecurePark tech better its reliability. MaxStorage tech provides a large storage space for user, maximum is 320GB. WhisperDrive tech decrease the noise procude by high-speed transfer or some other situation.
So, in my opinion, Western Digital Removable HDD is really a best choice for user because of its tech, security and high-speed transfermation.
7 choices, 40,60,80,120,160,250,320GB, all is just the same except capacity.