Really depends on PC system config, so YMMV
But a Y-cable is an excellent investment, s ...
anon893 發表於 2015-10-8 19:12
I am currently using 500GB Seagate Expansion Portable which draws 0.55A and is running perfectly fine under USB2.0.... I did some research and it is hard to find a 1TB 2.5 HDD which draws 0.5A power even with 5400rpm.
Can't trust anything bundled with the HDD, let alone those short cables
Just invest good money on another one (or a few more)
Besides, a good USB3 micro-b Y-cable only costs around $50
BTW if the external HDD is using JMicron JMS539 (or any other problematic) chipset inside the bridge controller, then yes it's going go cause trouble under certain USB2 connection such that a Y-calbe is absolutely necessary to power up the HDD
i have an old 5v 800mah HDD, still works under a single USB port.
it seems like USB is rated 500mah but it actually can go higher than that. e.g power supply is rated 500W but has a peak of 600W. that means that PS can output 600W but only for a short time.
so for me I don't worry about that too much. for yourself, just pick the HDD that suits the best for you.