SD card, HC type, problem.
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Posted by Terry Pinnell on May 17, 2008, 10:23 am
Please log in for more thread options capacity) some months ago. I could not get it to work in the Belkin Card Reader on my old XP SP1 PC, which I assumed was because that PC didn't have USB 2.0. So I bought a little USB adapter and that allowed me to read and write to it, albeit very slowly. I've finally upgraded my PC (to a MESH Xtreme GTS, Quad Core, 2.66 GHz) and expected to have no issues with reading this SD card with its built-in multi-card reader. But to my surprise that doesn't work either. Get either nothing (just hangs) or a message about I/O error. So I still have to go via the USB adapter. And even that still seems excruciatingly slow. I have only the one HC card and so cannot make any comparative tests. Is this a common problem please? -- Terry, East Grinstead, UK | |||||||||||||||||||||||||
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Posted by Joel on May 17, 2008, 5:29 pm
Please log in for more thread options I guess the problem is SD (limit to 2GB max) and SDHC (it's up to 8GB at the moment I believe as I have 8GB SDHC) they look alike and work similar to each other *but* they are not 100% identical. So, in order to use the SDHC whatever device you want to use must have SDHC supported (most electronics devices like camera, GPS etc. can be upgraded by Firmware), and if you want to read the SDHC memory card then you have to make sure that the reader supports *both* SD & SDHC. I believe SDHC is backward compatible, but SD can't read SDHC | |||||||||||||||||||||||||
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Posted by Paul on May 17, 2008, 5:38 pm
Please log in for more thread options Terry Pinnell wrote:
> I have a 4 GB 'SDHC' SD card which I bought impulsively (cheap, high
> capacity) some months ago. I could not get it to work in the Belkin > Card Reader on my old XP SP1 PC, which I assumed was because that PC > didn't have USB 2.0. So I bought a little USB adapter and that allowed > me to read and write to it, albeit very slowly. > > I've finally upgraded my PC (to a MESH Xtreme GTS, Quad Core, 2.66 > GHz) and expected to have no issues with reading this SD card with its > built-in multi-card reader. But to my surprise that doesn't work > either. Get either nothing (just hangs) or a message about I/O error. > So I still have to go via the USB adapter. And even that still seems > excruciatingly slow. > > I have only the one HC card and so cannot make any comparative tests. > Is this a common problem please? > There is an article here on SDHC. http://en.wikipedia.org/wiki/Secure_digital#SDHC With your working USB device, you can use something like UVCView to look at the characteristics of the device. Where it shows up in the UVCView window, tells you whether it is running at USB 1.1 or USB 2.0 rates. You can also interpret the info in the right hand side of the window, and determine the operating speed there. http://web.archive.org/web/20060509061220/http://download.microsoft.com/download/e/b/a/eba1050f-a31d-436b-9281-92cdfeae4b45/UVCView.x86.exe The UVCView window looks similar to this. http://www.die.de/blog/content/binary/usbview.png There are some benchmarks here. Access time is slightly below 1 millisecond, and part of that is due to USB. The SSD tested in the article, reaches 0.1 milliseconds, by comparison. You could carry out a similar test, using HDTune (hdtune.com), and look at the transfer rate curve. (Hard drives are curved, while flash should have a constant transfer rate versus position in the device.) "SDHC Cards vs Hard Drive vs SSD - Feb.17,2008" http://www.notebookreview.com/default.asp?newsID=4258 Paul | |||||||||||||||||||||||||
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Posted by kony on May 17, 2008, 10:28 pm
Please log in for more thread options On Sat, 17 May 2008 15:23:10 +0100, Terry Pinnell
>I have a 4 GB 'SDHC' SD card which I bought impulsively (cheap, high
>capacity) some months ago. I could not get it to work in the Belkin >Card Reader on my old XP SP1 PC, which I assumed was because that PC >didn't have USB 2.0. So I bought a little USB adapter and that allowed >me to read and write to it, albeit very slowly. > >I've finally upgraded my PC (to a MESH Xtreme GTS, Quad Core, 2.66 >GHz) and expected to have no issues with reading this SD card with its >built-in multi-card reader. But to my surprise that doesn't work >either. Get either nothing (just hangs) or a message about I/O error. >So I still have to go via the USB adapter. And even that still seems >excruciatingly slow. > >I have only the one HC card and so cannot make any comparative tests. >Is this a common problem please? The card reader has to support SDHC, and yours apparently does not. As you saw, USB1 vs 2 doesn't matter except for the obvious - the difference in transfer speed. Similarly many old gear that uses SD cards won't use SDHC, and there was an overlap where some devices might support 4GB SD but not 4GB SDHC cards (like my old MP3 player and some cameras, though often they don't mention having 4GB support at all but some owners have randomly tried and found that IF the device can support FAT32 instead of just FAT16 due to inherant filesystem capacity issue of a 2GB limit to FAT16, then they can use full capacity of a 4GB SD card. | |||||||||||||||||||||||||
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Posted by Terry Pinnell on May 18, 2008, 1:16 am
Please log in for more thread options
>On Sat, 17 May 2008 15:23:10 +0100, Terry Pinnell
> >>I have a 4 GB 'SDHC' SD card which I bought impulsively (cheap, high
>>capacity) some months ago. I could not get it to work in the Belkin >>Card Reader on my old XP SP1 PC, which I assumed was because that PC >>didn't have USB 2.0. So I bought a little USB adapter and that allowed >>me to read and write to it, albeit very slowly. >> >>I've finally upgraded my PC (to a MESH Xtreme GTS, Quad Core, 2.66 >>GHz) and expected to have no issues with reading this SD card with its >>built-in multi-card reader. But to my surprise that doesn't work >>either. Get either nothing (just hangs) or a message about I/O error. >>So I still have to go via the USB adapter. And even that still seems >>excruciatingly slow. >> >>I have only the one HC card and so cannot make any comparative tests. >>Is this a common problem please? >
>The card reader has to support SDHC, and yours apparently >does not. As you saw, USB1 vs 2 doesn't matter except for >the obvious - the difference in transfer speed. > >Similarly many old gear that uses SD cards won't use SDHC, >and there was an overlap where some devices might support >4GB SD but not 4GB SDHC cards (like my old MP3 player and >some cameras, though often they don't mention having 4GB >support at all but some owners have randomly tried and found >that IF the device can support FAT32 instead of just FAT16 >due to inherant filesystem capacity issue of a 2GB limit to >FAT16, then they can use full capacity of a 4GB SD card. Thanks all, very helpful. Looks like I'll have to a) Continue using the adapter (which is just that little bit too large to fit alongside another socket in use!) b) Reconcile myself to slowness; at least, until I can get hold of another faster SDHC card. -- Terry, East Grinstead, UK | |||||||||||||||||||||||||
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> capacity) some months ago. I could not get it to work in the Belkin
> Card Reader on my old XP SP1 PC, which I assumed was because that PC
> didn't have USB 2.0. So I bought a little USB adapter and that allowed
> me to read and write to it, albeit very slowly.
>
> I've finally upgraded my PC (to a MESH Xtreme GTS, Quad Core, 2.66
> GHz) and expected to have no issues with reading this SD card with its
> built-in multi-card reader. But to my surprise that doesn't work
> either. Get either nothing (just hangs) or a message about I/O error.
> So I still have to go via the USB adapter. And even that still seems
> excruciatingly slow.
>
> I have only the one HC card and so cannot make any comparative tests.
> Is this a common problem please?