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Old 09-24-2014, 05:17 PM   #121
beenlord
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Quote:
Originally Posted by JeremyBoden View Post
According to the description on the Amazon site

But if you are using a USB2 connection, is the connection supplying sufficient power to the disk?
i think so :S i have an 800W power supply and mid range hardware so there should be plenty of power left for the disk to use, it ran ubuntu and linux fine, it even managed to handle data heavy tasks like video games, granted there was a bit of lag when particles appeared but i imagine that was due to Nvidia driver issues with openGL or something
 
Old 09-24-2014, 08:05 PM   #122
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You can't provide dozens of amps down a little USB connector. Indeed:-

According to Wikipedia,
Quote:
The USB 1.x and 2.0 specifications provide a 5 V supply on a single wire to power connected USB devices. The specification provides for no more than 5.25 V and no less than 4.75 V (5 V 5%) between the positive and negative bus power lines (VBUS voltage). For USB 3.0, the voltage supplied by low-powered hub ports is 4.45–5.25 V.

A unit load is defined as 100 mA in USB 2.0, and 150 mA in USB 3.0. A device may draw a maximum of five unit loads (500 mA) from a port in USB 2.0, or six unit loads (900 mA) in USB 3.0. There are two types of device: low-power and high-power. A low-power device (such as a USB HID) draws at most one-unit load, with minimum operating voltage of 4.4 V in USB 2.0, and 4 V in USB 3.0.
Disks usually require more than 500mA.

I think its possible to buy special cables that take power from 2 USB2 ports, but signals from only one of them.

Last edited by JeremyBoden; 09-24-2014 at 08:13 PM.
 
Old 09-25-2014, 10:24 AM   #123
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Quote:
Originally Posted by JeremyBoden View Post
You can't provide dozens of amps down a little USB connector. Indeed:-

According to Wikipedia,

Disks usually require more than 500mA.

I think its possible to buy special cables that take power from 2 USB2 ports, but signals from only one of them.
i seem to remember something about usb installations on an ubuntu website, if i recall it said usb 1 would be slower than a live boot cd, usb 2 would be slightly faster than a liveboot cd and usb 3 would be about as fast as a regular hard drive

i'm personally not too bothered about its speed as long as it functions.

Last edited by beenlord; 09-25-2014 at 10:26 AM.
 
Old 09-25-2014, 12:24 PM   #124
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But to get optimum results you have to plug to a usb3 port. Btw do you have the cord to use 2 ports? If you need me 2 I can take a photo of mine & upload it.
 
Old 09-25-2014, 12:41 PM   #125
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But to get optimum results you have to plug to a usb3 port. Btw do you have the cord to use 2 ports? If you need me 2 I can take a photo of mine & upload it.
i had a look on amazon and found a pcie card that has five usb3 slots, considering my creative sound card doesn't seem to work with linux i suppose it would be best to remove that sound card, replace it with the usb 3 extention and then use my motherboards on board sound card

Last edited by beenlord; 09-25-2014 at 02:09 PM.
 
Old 09-26-2014, 01:31 PM   #126
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Originally Posted by EDDY1 View Post
But to get optimum results you have to plug to a usb3 port. Btw do you have the cord to use 2 ports? If you need me 2 I can take a photo of mine & upload it.
so anyway, once i have the external hard drive connected to the usb 3 slot will we be able to continue investigation into why its not booting?
 
Old 09-26-2014, 06:40 PM   #127
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Assuming the cause is due to the lack of a USB3 socket, we can do so.

Alternatively, why not boot from the nearly empty 80GB drive?
If it was me, I'd put / on the 80GB drive and /home on the 500GB drive.
 
Old 09-26-2014, 06:51 PM   #128
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Originally Posted by JeremyBoden View Post
Assuming the cause is due to the lack of a USB3 socket, we can do so.

Alternatively, why not boot from the nearly empty 80GB drive?
If it was me, I'd put / on the 80GB drive and /home on the 500GB drive.
its not nearly empty though theres only 4 gigabytes of free space left.

and no i didn't fill it up that much by choice, its the little things that people feel they NEED to put on C drive that have just built up to the point of hardly having any space left :S

Last edited by beenlord; 09-26-2014 at 06:59 PM.
 
Old 09-27-2014, 10:39 AM   #129
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oh by the way, is there a way to list the current power that hardware is using? considering i have an 800w power supply i want to make sure i won't overload it by plugging too many things in
 
Old 09-27-2014, 12:48 PM   #130
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Look on the external drive - the serial number plate should have voltage / current consumption.
It would be very hard to overload an 800W PSU by plugging things in.

[With the exception of high powered graphics cards].
 
Old 09-27-2014, 02:00 PM   #131
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Originally Posted by JeremyBoden View Post
Look on the external drive - the serial number plate should have voltage / current consumption.
It would be very hard to overload an 800W PSU by plugging things in.

[With the exception of high powered graphics cards].
it says around 5 volts so it should be fine.
 
Old 09-27-2014, 06:04 PM   #132
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If you look back to the Wikipedia extract, you will see that USB supplies 5V.
The crucial point is whether your disk consumes more than 500mA (refer to article).

Note that if the figure for power consumption exceeds 2.5W then you have an insufficient current supply with USB2.
A USB3 connection could supply up to 4.5W.

A simple formula :- Volts x Current(in Amps) = Power(in Watts).

BTW Have you read the no-star reviews on Amazon for this product?
There is a lot of anger out there...

Last edited by JeremyBoden; 09-27-2014 at 06:29 PM.
 
Old 09-27-2014, 06:39 PM   #133
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Originally Posted by JeremyBoden View Post
If you look back to the Wikipedia extract, you will see that USB supplies 5V.
The crucial point is whether your disk consumes more than 500mA (refer to article).

Note that if the figure for power consumption exceeds 2.5W then you have an insufficient current supply with USB2.
A USB3 connection could supply up to 4.5W.

A simple formula :- Volts x Current(in Amps) = Power(in Watts).

BTW Have you read the no-star reviews on Amazon for this product?
There is a lot of anger out there...
apparently a few people can't get it to work, but for the vast majority of reviewers it works fine
 
Old 09-27-2014, 07:50 PM   #134
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OK.
Just a thought - is the cable similar to the picture on http://www.amazon.co.uk/Ex-Pro%C2%AE...ds=usb+micro-b?

If so, are BOTH USB2 cables inserted into the PC?
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Old 09-27-2014, 08:17 PM   #135
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Quote:
Originally Posted by JeremyBoden View Post
OK.
Just a thought - is the cable similar to the picture on http://www.amazon.co.uk/Ex-Pro%C2%AE...ds=usb+micro-b?

If so, are BOTH USB2 cables inserted into the PC?
http://www.amazon.co.uk/gp/product/B...?ie=UTF8&psc=1 no its this thing, its an actual card thats inserted into one of the pci-e slots
 
  


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