Thomas Vecchione wrote:
My experience with notebook hard drives in external cases is they almost
all work without either an external power supply or using 2 USB
connections (2nd for additional power). I have 2 notebook hard drives
here in external USB cases, and they both have worked fine on three
Toshiba notebooks here (all low-end Toshibas), modern and very old Dell
business laptops, Asus netbooks, a very old IBM Thinkpad, and HP/Compaq
The older of the 2 external cases didn't cooperate with a
decidedly-high-end Sony Vaio notebook; that required using the 2nd USB
connection for extra power.
Since I was having trouble with the older external case mentioned above,
I contacted the vendor. They pointed out that the drive controller
circuitry draws power, in addition to whatever power the drive inside
pulls. Apparently the circuitry in that older case was drawing just
enough more to take power consumption over the limit and the notebook's
USB power protection would shut off power to the device trying to draw
too much power.
I can recommend Nextech's NX2 external USB drive housing, works
beautifully and currently holds a Toshiba 60GB 7200RPM notebook hard
drive. While it includes a 2-connector USB cable (2nd one just brings in
USB power connection), I've never needed to use it.
I don't know what the impact of laptop power management might have on
supplying current to USB ports when running on battery.
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