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Is it possible for a 7 port USB hub with a 5V 1A power adapter to power 7 USB hard drives?

HI,

So I got this 7 port USB 2.0 hub from ebay which came with a 5V 1A power adapter, and I'm sorta skeptical about weather or not it will be able to power 7 hard drives connected to it via a SATA to USB converter. Do I need to get a power adapter with a higher amperage of say about 7A to be able to connect 7 hard drives to the hub and expect them to just work without any issues?

Thanks!
8 answers Last reply Best Answer
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  1. No, typical harddrive power usage is about 5W, 1amp multiplied by 5V is 5W, so you'd need about a 3.5A PSU, BUT there is no guarantee that it can distribute the power correctly.
  2. 13thmonkey said:
    No, typical harddrive power usage is about 5W, 1amp multiplied by 5V is 5W, so you'd need about a 3.5A PSU, BUT there is no guarantee that it can distribute the power correctly.


    Based on your post I can conclude that each hard drive needs 1 amp; if each hard drive needs 1 amp then doesn't that mean if i wanted to connect 7 hard drives I'd need a 7A PSU (1A * 7HDDs)?
  3. 13thmonkey said:
    No, typical harddrive power usage is about 5W, 1amp multiplied by 5V is 5W, so you'd need about a 3.5A PSU, BUT there is no guarantee that it can distribute the power correctly.


    Will it be okay if I use a 4A power supply? Because I have one of those lying around.
  4. SRC_S said:
    13thmonkey said:
    No, typical harddrive power usage is about 5W, 1amp multiplied by 5V is 5W, so you'd need about a 3.5A PSU, BUT there is no guarantee that it can distribute the power correctly.


    Based on your post I can conclude that each hard drive needs 1 amp; if each hard drive needs 1 amp then doesn't that mean if i wanted to connect 7 hard drives I'd need a 7A PSU (1A * 7HDDs)?


    yes, i'm still seeing 7x0.5 in my head for reasons unknown.
  5. SRC_S said:
    13thmonkey said:
    No, typical harddrive power usage is about 5W, 1amp multiplied by 5V is 5W, so you'd need about a 3.5A PSU, BUT there is no guarantee that it can distribute the power correctly.


    Will it be okay if I use a 4A power supply? Because I have one of those lying around.


    maybe/maybe not, it's quite possible that the controller can only take 1A max, or 1A+ safety margin max. Why would you build in a 7A controller (that's actually quite a lot of current).

    In post apocalypse world where you only had a 4A, then i'd consider it, and very carefully consider the order you plugged drives in. But that's not where we are, SO, why do you want to plug 7 HDDs into a USB port.
  6. 13thmonkey said:
    SRC_S said:
    13thmonkey said:
    No, typical harddrive power usage is about 5W, 1amp multiplied by 5V is 5W, so you'd need about a 3.5A PSU, BUT there is no guarantee that it can distribute the power correctly.


    Will it be okay if I use a 4A power supply? Because I have one of those lying around.


    maybe/maybe not, it's quite possible that the controller can only take 1A max, or 1A+ safety margin max. Why would you build in a 7A controller (that's actually quite a lot of current).

    In post apocalypse world where you only had a 4A, then i'd consider it, and very carefully consider the order you plugged drives in. But that's not where we are, SO, why do you want to plug 7 HDDs into a USB port.


    Because I'm all out of SATA ports. :P
  7. 13thmonkey said:
    SRC_S said:
    13thmonkey said:
    No, typical harddrive power usage is about 5W, 1amp multiplied by 5V is 5W, so you'd need about a 3.5A PSU, BUT there is no guarantee that it can distribute the power correctly.


    Based on your post I can conclude that each hard drive needs 1 amp; if each hard drive needs 1 amp then doesn't that mean if i wanted to connect 7 hard drives I'd need a 7A PSU (1A * 7HDDs)?


    yes, i'm still seeing 7x0.5 in my head for reasons unknown.


    Is getting a 7A PSU sorts redundant, because the hub is a USB 2.0 hub and the max current a single USB port can supply is 0.5A based on USB 2.0 standards
  8. Best answer
    probably yes, get a PCI-E SATA card, or something more like this: https://www.scan.co.uk/products/4-bay-icy-box-ib-3640su3-external-jbod-system-for-35-sata-hdds-with-usb-30-and-esata-host
    There's something in the US with an identical picture. Note you need a port multiplier for esata to work, but thats a £20 pci-E card.
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