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Twisti
Posts: 1
Registered: ‎04-15-2012
Location: Germany
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Lenovo IdeaPad USB file transfer INCREDIBLY slow (crippling!)

Hi,

 

I have a Lenovo IdeaPad A1 - 07, and what I do is plug in the USB cable, connect it to my computer, and click "Turn on USB storage" and "OK". Then, I try to copy a 'huge' file to it with Windows 7 Explorer (where 'huge' means anything between 100mb and 2gb). I only ever get ~2mb/s. This problem is consistent between different computers.

 

Is this a design mistake ? Am I 'doing it wrong' ? Since it happens on different computers, all of which showing ~60mb/s speeds with my normal $5 USB stick, I doubt it's a problem with my computers, settings, drivers, BIOS, cables, etc.

 

Ideas ?

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mclandytm
Posts: 261
Registered: ‎08-26-2009
Location: Virginia, USA
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Re: Lenovo IdeaPad USB file transfer INCREDIBLY slow (crippling!)


Twisti wrote:

Hi,

 

I have a Lenovo IdeaPad A1 - 07, and what I do is plug in the USB cable, connect it to my computer, and click "Turn on USB storage" and "OK". Then, I try to copy a 'huge' file to it with Windows 7 Explorer (where 'huge' means anything between 100mb and 2gb). I only ever get ~2mb/s. This problem is consistent between different computers.

 

Is this a design mistake ? Am I 'doing it wrong' ? Since it happens on different computers, all of which showing ~60mb/s speeds with my normal $5 USB stick, I doubt it's a problem with my computers, settings, drivers, BIOS, cables, etc.

 

Ideas ?


I actually have a K1, but I would say my experience is about the same, that data downloads from a PC host average about 2MBytes/sec.

 

One reason for the difference is that, unlike a flash drive, the internal flash memory of the tablet is not hard-wired to the USB host interface.  Instead, there is a software service that gets started when the tablet is connected to a host, and that service handles the transfer of data between the USB host interface and flash memory.   So that adds a fair amount of extra latency to the transfer process.

 

Second, I am a little perplexed by your assertion that you have a flash drive (especially a $5 one!) with write speeds of 60 MBytes/sec.  60MBytes/sec is actually the pure theoretical maximum transfer speed for a USB 2.0 interface, which means you won't actually achieve "real" data transfer speeds nearly that fast, let alone flash write speeds.  Most flash drives (other than some really expensive ones) have write speeds in the 5-25 MBytes/sec range.  You can see a wide variety of actual test results here: http://usbspeed.nirsoft.net/   Even an SD card that is defined as a "fast" Class 10 (and I doubt the tablet's internal flash is even that fast) just supports 10MBytes/sec write speeds, although many test out a little better than that.  So 60 MBytes/sec seems completely unrealistic, but without knowing how you're testing it, I can't explain why.  Perhaps if you have write caching turned on, it's throwing the test resuts off, since the actual writes get done in the background.

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aleafonthewind
Posts: 250
Registered: ‎12-27-2011
Location: United States
0

Re: Lenovo IdeaPad USB file transfer INCREDIBLY slow (crippling!)

Just throwing this out there:

 

eSATAp ports allow transfer speeds of up to 480 MBps with a USB 2.0 device. So I suppose it is possible to get ~60MBps with one of those ports.

 

I experience the same transfer rates as you guys and I own a K1 as well.

Posts: 1,476
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Registered: ‎04-20-2010
Location: Jeffersonville, Indiana
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Re: Lenovo IdeaPad USB file transfer INCREDIBLY slow (crippling!)

I had slows speeds just the other day, but I just thought it was my PC, as my thumdrives where slow too. I will try again today on a faster USB3 slot since it has more power.
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mclandytm
Posts: 261
Registered: ‎08-26-2009
Location: Virginia, USA

Re: Lenovo IdeaPad USB file transfer INCREDIBLY slow (crippling!)


aleafonthewind wrote:

Just throwing this out there:

 

eSATAp ports allow transfer speeds of up to 480 MBps with a USB 2.0 device. So I suppose it is possible to get ~60MBps with one of those ports.

 

I experience the same transfer rates as you guys and I own a K1 as well.


eSATAp supports the same speeds at the physical USB port used, so if it's a USB 2.0 port, it supports only 60 MBytes/sec (which sometimes is specified as 480 Mbits/sec -- which is why I was careful to spell it out).  And regardless of whether you have an eSATAp with USB 3.0 port, or a "real" USB 3.0, they are both backward compatible with USB 2.0 devices, which means they will automatically "downshift" to the speed supported by the target device.  In the case of the IdeaPad tablets, that's USB 2.0, so the theoretical maximum is still 60 MBytes/sec, and connecting it to a faster host device will not make it go any faster.

 

Someone may sell a USB 3.0 flash drive that can write at 60MBytes/sec on a USB 3.0 host port, but I guarantee it doesn't cost anywhere near $5.

 

In any case, even a USB 2.0 connection can transfer data faster than it can be written to most flash memories, so USB is not really the bottleneck in this case.  I suspect Lenovo is using somethng like a Class 4 for the internal tablet flash (4 MBytes/sec write speed), and the software latency brings it down to the speed we're seeing.

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aleafonthewind
Posts: 250
Registered: ‎12-27-2011
Location: United States
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Re: Lenovo IdeaPad USB file transfer INCREDIBLY slow (crippling!)

Apologies. You know more on the topic than I do, I just pulled that off of Wikipedia (and it was Mbps not MBps, again, my apologies). It occurred to me because my computer has an eSATAp port.

 

In that case, I wonder as well how he gets 60 MBps..

 

Anyway, for large file transfers (1GB+) I just use my MicroSD adapter and transfer direct. Takes to long otherwise.

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mclandytm
Posts: 261
Registered: ‎08-26-2009
Location: Virginia, USA
0

Re: Lenovo IdeaPad USB file transfer INCREDIBLY slow (crippling!)


aleafonthewind wrote:
 

Anyway, for large file transfers (1GB+) I just use my MicroSD adapter and transfer direct. Takes to long otherwise.


Yep, that's about the fastest way to get it done.  WiFi and Bluetooth download transfers are (in my experience) even slower than the USB.

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Clear_Blue_Lou
Posts: 143
Registered: ‎12-09-2011
Location: Mississauga, Ontario, Canada
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Re: Lenovo IdeaPad USB file transfer INCREDIBLY slow (crippling!)

I routinely record movies from cable TV to my PC, then transfer them to my K1 to watch during my train commute.

 

These files are 7GB-10GB in size, and will copy over USB to the K1 in about 15-25 minutes - even though the estimated time is always 2 hrs. or more!

 

BTW, that's copying to main memory. Copying to the microSDHC external card takes about 50% longer. And yes, Bluetooth or even Wifi is even slower.

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mclandytm
Posts: 261
Registered: ‎08-26-2009
Location: Virginia, USA
0

Re: Lenovo IdeaPad USB file transfer INCREDIBLY slow (crippling!)


Clear_Blue_Lou wrote:

I routinely record movies from cable TV to my PC, then transfer them to my K1 to watch during my train commute.

 

These files are 7GB-10GB in size, and will copy over USB to the K1 in about 15-25 minutes - even though the estimated time is always 2 hrs. or more!

 

BTW, that's copying to main memory. Copying to the microSDHC external card takes about 50% longer. And yes, Bluetooth or even Wifi is even slower.


Well, now, that's another puzzler.  Not so much because of the transfer speed (which, as a rough estimate, would be around 6 MBytes/sec if true), but because the FAT32 file system in the K1 only supports file sizes up to 4GB (definitely a hard limit on FAT32).  There has actually been lots of discussion about this, since the 4GB size limit does come into play with videos.  So I'm wondering if it really is transferring the whole video (if the transfer failed once it reached 4GB, that might explain the difference between the estimate and the actual), but I would assume that the truncated video would be pretty obvious?

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Clear_Blue_Lou
Posts: 143
Registered: ‎12-09-2011
Location: Mississauga, Ontario, Canada
0

Re: Lenovo IdeaPad USB file transfer INCREDIBLY slow (crippling!)

On the K1 or on the A1?

 

On my K1, I have no truncated files, and so far I've watched almost a dozen movies that I copied over this way. (Actually, in one case the file was truncated, but only because the tablet went to sleep while copying. I baby-sit the process now, swiping the screen every few minutes until the copying is finished.)

 

Right now, Astro File Manager reports that I have two movies in /mnt/sdcard/movies: "Monsters Vs. Aliens" at 7.40 GB and "A Funny Thing Happened on the Way to the Forum" at 6.03 GB.