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3383 Posts

12-22-2008

CA

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Re: TPT2 has USB port power issue

2014-03-02, 16:52 PM

wrote:

so my external harddrive producer lied when it says that my harddrive is compatible with USB2.0?


If the external hard drive draws more than 500ma then the device does not comply with the USB 2.0 specification. 


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179 Posts

11-22-2010

Cooperstown, NY

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Re: TPT2 has USB port power issue

2014-03-02, 17:05 PM

THOR-00:

 

I think you are misunderstanding what is going on here.

 

The different variations of USB have multiple components, two of which are the speed the devices transfer data and the amount of power they can provide to daughter devices. Originally, USB was intended as a replacement for serial and input device ports, so it carried just enough power for keyboards and mice, and worked at relatively slow speeds. At some point it they added a high and low speed option, but if a low speed device was attached to the same channel as a high speed device, then all devices on the channel slowed to the speed of the low speed device.

 

At some point, devices started having lesser power requirements, and bigger devices were powerable from the USB port. My personal favorite was Canon's LIDE scanners, which allowed for letter size scanning and a single cable on the desk. Hard disk drives and DVD burners were also added to this mix.

 

However, some manufacturers pushed the boundaries of what could be accomplished from a single USB port. And some laptop and desktop makers, worried about the possibility of burned out ports, were making it possible to deliver more power through the ports than norrmal. That is why some external DVD burners, including Lenovo's consumer model, come with a Y usb cable: if the USB port on the computer is not providing enough power, then the user plugs a second usb cable into the computer, and the second cable only carries power to the device.

 

If your hard disk is rated for USB 2.0, that is likely only descriptive of the speed bandwidth at which it operates. How much power it draws is unknown (at least on this forum) but is likely more than the spec's for a single full size usb port. If you can, I'd recommend returning the drive, and consider instead getting a high capacity USB key. 128gb keys are now under $100 and work fine with the Tablet 2.

 

You should also be aware that even if you can get power to the device, some external devices just don't work well with the USB port on the Tablet 2. I have an external USB 2.0/eSATA blu-ray burner, which has it's own power supply, which just does not work well with the Tablet at all, be it through the built in port or the docking station.

 

Good luck.

Jonathan Becker
------------------------------------
CURRENT LENOVO PRODUCTS: Thinkpad Tablet 2
sn #R9WHND7, Win 8 Pro, BIOS 1.51, with Dock and TPT2 keyboard
Thinkpad USB Keyboard with Trackpoint
IdeaCenter B500

PAST: Thinkpad T22, X60 Tablet, X220 Tablet
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233 Posts

01-23-2014

US

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Re: TPT2 has USB port power issue

2014-03-07, 14:34 PM

I have not plowed through all of the posts on this thread so this may have been suggested already. I have used portable hard drives with many tablets and phones. None could access the drive without supplemental power. With an easily available Y USB cable to supply supplemental power the TP2 will probably access a portable drive just fine. It worked with a Dell Venue 8 Pro I had before I returned it to wait for a ThinkPad 8. When I do use an external HDD with the Y cable I use an external battery to supply the power because it is more convenient than plugging into a fixed USB power supply.

 

Just search for Y usb cable on the big website that begins with A.

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95 Posts

12-07-2007

St Louis, Missouri

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Re: TPT2 has USB port power issue

2014-03-07, 21:48 PM

Surface Pro 1 does not need any additional power when operaing a Toshiba v63600-C, 1 TB DRIVE @ 5V, 1.0 amp or the LG DVD WRITER, model GP40NB40 @5V, 1.6 AMPS. These are not operated concurrently.  The TPT2 could not operate either of these without an additional power supply so i returned it.  The Surface Pro 1 has a USB 3.0 port, which is much faster than the TPT2's 2.0  

T60: 6371-CTO, VISTA Home Premium+SP1, 2GB....R51: 1836-Q4U,XP,1GB...600...755CD
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2 Posts

04-10-2014

New York

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Re: TPT2 has USB port power issue

2014-04-10, 15:07 PM

I have a similar problem with not being able to use my WD Passport External HD on the TPT2.  I tried updating the drivers, assigning a drive letter, etc.

 

If power is an issue, would it be possible to use a USB Y cable (3 male ends), with 1 end going into the external HD, 1 going into the TPT2 and 1 another laptop/PC (just to provide extra power from)?

 

Another alternative if the solution of the $100 TPT2 dock is a bit expensive: how about using the y cable and a $20-30 external USB power hub to power the external drive and connect it to the TPT2?

 

I haven't tried these yet but if someone advises me these may work, I'll purchase the necessary items.

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8 Posts

09-23-2009

US

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Re: TPT2 has USB port power issue

2014-04-10, 15:16 PM
I've been using an EasyAcc WIFI power bank to work around the USB hard drive issue. Here's a link:

http://www.amazon.com/gp/aw/d/B00CSFCYFY/ref=sr_sp-btf_title_1_7?qid=1397142620&sr=8-7

It has proven to be an excellent travel companion not the least because you don't need an ugly ungainly y cable arrangement and you can keep the hard drive stored out of sight in a bag. The other added benefit is that the hard drive is powered by the power bank, not the tablet.
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2 Posts

04-10-2014

New York

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Re: TPT2 has USB port power issue

2014-04-10, 15:37 PM

Thanks for the tip.  I may go with that option but if a $5 USB Y cable will work, I'd rather use it to save money.  Has anyone ever tried this (i.e. connecting an external HD to the TPT2 and a 3rd device (laptop/PC/USB power hub) to draw power from via a Y cable)?

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3383 Posts

12-22-2008

CA

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Re: TPT2 has USB port power issue

2014-04-10, 16:35 PM

wrote:

Has anyone ever tried this (i.e. connecting an external HD to the TPT2 and a 3rd device (laptop/PC/USB power hub) to draw power from via a Y cable)?


A Y-cable will work. This has been discussed several times earlier in the thread.

 

However there may be an issue if you use a spare USB port on another computer. That computer may detect the external HDD as well and try to access it. That could lead to error messages at best and a corrupted file system at worst. My suggestion would be to connect the second plug in the Y to a power source only, e.g. an a USB charger that provides only 5V DC and has no data connections.


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20 Posts

08-09-2014

US

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Re: TPT2 has USB port power issue

2014-08-19, 16:06 PM
I agree ... Lenovo ought to offer free something to get around this problem ... docks or powered USB hubs, anything! I just bought a used TPT2 and have wasted many hours on this issue. Also, my laptop won't recognize the TPT2, so I can't do a direct file transfer. So frustrating!
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1118 Posts

12-06-2012

NL

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Re: TPT2 has USB port power issue

2014-08-19, 16:36 PM

wrote:
Also, my laptop won't recognize the TPT2, so I can't do a direct file transfer. So frustrating!

The TPT2 is a full Windows PC, not a smartphone - if you're trying to connect it to your laptop with an ordinary USB cable then that won't work. Both the TPT2 and the laptop are "host" devices in this scenario. If you want to connect two host devices together, then you need a special USB Bridge cable...

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The large print: please read the Community Participation Rules before posting. Include as much information as possible: model, machine type, operating system, and a descriptive subject line. Do not include personal information: serial number, telephone number, email address, etc.

 

The fine print: I do not work for, nor do I speak for Lenovo. Unsolicited private messages will be ignored. ...

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