SD Card reading problem

Hi Ro Bobo

If it works in the other laptop it seems the issue would be the card readers or computer. Do you have access to another computer with a card reader, preferably a fairly new computer? Moreover,never ever use SD card Adapters for formatting.Always USB card readers as they are more efficient.Generic operating system formatters don’t provide the optimum performance.And,sometimes,can result into SD card death and less picture-saving space.

Full format once in awhile is recommended to prevent possible corrupt files, lengthen the life of the card and achieve the most available space possible.

This tool is compatible with Windows XP and vista however Windows 7 users can run this tool in Compatibility mode for Windows 7.You can also try the HP USB Format tool: Download HP USB Disk Storage Format Tool | PCWorld

Generally, older card readers have problems with newer SD Cards. I see this every Day when I am repairing computers. Try that USB Format tool above see what happens.

Dan

http://www.geekazoidtech.com

Hi Dan,

Thanks for your great reply!!!

I am using the SD card reader embedded in the laptops. Will it be better to use an external SD card reader to carry format, read and write?

Thank you again!

Robobo

Robo you cam do that, but make sure it is Isn 2.0 or 3.0 so there is no question on compatibility.  If you need more help let me know.

Dan

Sent from my T-Mobile 4G LTE Device

As even the internal reader is most lightly USB then that should be a good solution. Then it should be consistent no matter what your connected to

USB 1.0 has issues with some of the newer SD Cards and Readers.  They have been known to corrupt data and erase data. I have had issues in the past where some of my clients data on their SD cards from their digital camera were either not saving correctly or erasing data on the card. USB 1.0 even has issues sometimes with it's own  version of card reader. Case in point, I  had a gentleman doing astronomical picture processing and he has a picture processing of Saturn and it deleted the processing and original pictures.

They fixed most of the issued in USB 2.0 and above.

Dan

http://www.geekazoidtech.com

Most internal devices are in fact  USB as it's just the simplest way of putting all the stuff from different manufacturers together with some chance of success. I find the USB1 devices to be a bit cheap and awful. I use a Kingston USB3 card reader and obviously get very high read write speeds. Compatibility can sometimes be an issue but more when you are writing Gigabytes of Raw data so I often use smaller block sizes like 64K for 'dd' and the like.

Writing at the very highest speeds can sometimes be problematic and some unexpected compatibility issues can arise.

No point talking in the general other than it does sometimes happen compatibility is obviously an individual problem

Dan, problem-origin-finding is VERY difficult. You encountered a situation where switching from an USB-1.1 adapter to an USB-2.0 adapter solved your problem. That does not mean that "all USB1.1 adapters will corrupt data", or that "all USB-2.0 adapters will NOT corrupt data".

USB 1.1 specifies a way for a computer to communicate with a device at 12 megabits per second. USB 2.0 species a 480mbps mode (as well as the older modes for older/cheaper devices).  But besides the speed change, nothing much changed. An USB 1.1 SD card reader should work, just as well as an USB-2.0 card reader. The USB-2.0 one will be a lot faster. Most cards can nowadays read/write at around 16Mb per second, which is about 20 times faster as what you can achieve over the 12mbps USB-1.1 link.

The speed difference can in practise cause "problems". Write a 250Mb saturn-image on the SD card, and you'll have to wait almost five minutes for the data to be written to the card. The blinky-light might be constant-on due to the constant writing, and the user might pull the card before the computer is done writing. Causing corruption. Or the cable for the USB-1.1 cardreader was flaky. Or maybe the device driver for the hardware. I don't know. You don't know.

You attribute the "problem solved" to one aspect of what you changed (USB-1.1 vs USB-2.0). In practise a few more things changed. Which one actually solved the problem, nobody knows. For your client it's fine that you solved the problem. And maybe the "story" (true or not) that the cause was using USB-1.1 instead of USB-2.0 is useful for business relationships and piece-of-mind. "I don't know what caused it, but this new adapter seems to work better" is more difficult to sell than the other story.

So, I don't care what you tell your clients. But, claiming corruptions are universally caused by USB-1.1 adapters is wrong.

Roger thank you for the well thought response, however my response was not meant as an actual solution to the problem, merely it was to possibly point them into the right direction. When I say, I t worked for my client I meant it worked for my client. This was a totally different situation. You are correct in stating that. However I was conveying a possible direction to go with this for Ro Bobo. The writing of the Saturn images (Processing) took more time than that because of the high resolution of the photos taken. They were taken from a 3.5 Meter Telescope and were very detailed. I do not know you are correct as to how much time it took, all I was concerned with was the corruption of the SD Card, Nothing more.

You Said: "

So, I don't care what you tell your clients. But, claiming corruptions are universally caused by USB-1.1 adapters is wrong."

This was an assumption based on experience in the field, not actual fact. I should have stated that in my previous post.  I thank you for pointing that out because we all know what assumptions can do Roger. I usually tend to convey a message of experience mixed with knowledge, if they collide sometimes please bear with me.

Have a great rest of your weekend.

Dan

http://www.geekazoidtech.com

Hi there,

Seems like there is some sort of incompatibility between your built-in card reader and the SD card.

To find out the root cause someone would have to take a look on the SD bus to find out whats going on, with a bus analyzer and probably scope. Thats the way we would do it if one of our customers has such a incompatibility with our cards.

After you have found the root cause, you can probably find the device which is violating a spec as well.

As a workarount, I would use another USB SD reader with the notebook.

Best regards

Yeah. If you'd /need/ to find the root cause, yes. In practise, my guess is that the card-reader is at fault, and that if you blame it on the card, the problem will be solved. i.e. get a new / different brand card and it will work.

But still, technically, I suspect the host more than the card.... Just a hunch.... :-)