[外置硬碟] 單插頭 USB3.0 2.5" 外置硬碟 用 USB2.0 Port 問題

想買 1TB USB3.0 2.5" 外置硬碟,原本諗住買 HGST Touro S 7200rpm 但係見到有個 Post 話 USB2.0 會唔夠電 (Touro S 要 800mA 但 USB2.0 得 500mA)。Search 過其他 5400rpm 2.5" 外置硬碟發覺都要 >500mA 電。即係唔可以用原廠果條單頭 USB3.0 線插 USB2.0,要另外買條 Y-Cable 線?

SAMSUNG M3 Portable 1TB ST1000LM025 0.85A 5400rpm
Seagate Backup Plus Slim 2TB ST2000LM003 0.85A 5400rpm
Seagate Backup Plus Slim 1TB ST1000LM024 0.85A 5400rpm

本帖最後由 anon893 於 2015-10-8 22:46 編輯

回覆 1# 50144
Really depends on PC system config, so YMMV
But a Y-cable is an excellent investment, should you need it some day

Also when HDDs are run for a specific time, they might need more power to power up the spin motor due to normal wear

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回覆  50144
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.

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回覆 3# 50144
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

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回覆  50144
Can't trust anything bundled with the HDD, let alone those short cables
Just invest goo ...
anon893 發表於 2015-10-8 22:51


Understood, I guess I will go for this way. A Y-cable plus a 7200rpm hdd

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回覆 5# 50144
When power is in doubt, always use a Y-cable

If an HDD is driven under prolonged underpowered conditions there will be irreparable damage to the hardware

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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.

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i have an old 5v 800mah HDD, still works under a single USB port.
it seems like USB is rated 5 ...
chanmingfu 發表於 2015-10-9 12:17


Agree but as anon893 said, I will use a Y-cable for USB2.0 just to be safe.

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