Yes, I kind of took it for granted that someone would know the basic limits and free usb ports of their own system before buying any peripheral :wink:Counter, the power supply for the "small" via USB ones really depends on the individual system. There might be some systems, that are suppplied with enough power via one USB cable, but there are systems - depending on the mainboard, whci sometimes is trggered to its limits and is not able to let exernal drives run.
Especially on laptops this phenomen occurs often and is dicussed here more then once.
If you then go for an external "small" hdd and there is only one usb port available, the purchase might lead to frusatrtion.
If you can't check out if the systems system supports one-usb run and the purchase was made via the internet, you be alone with a non usable external hdd, becasue the small one usually do not have the option of external power supply.
Doing a generalisation based on an individual single system might sometimes be a "not so good" advice.