I have a PNY usb 2.0 combo. The usb ports work fine and read external drives etc. The SD readers quit working. The SD cards read fine on the internal mounted reader. My PC recognizes the drives, and t

Mini SD cards, or MicroSD cards, are used in digital cameras and portable media players to house digital media files.

MicroSD cards can house anything from 2GB to 32GB of information.
A write-protection feature gives the owner the ability to lock the MicroSD card to keep their files secure.

If you have a MicroSD card that is write-protected, you can un-write-protect it with a flip of a switch.
Insert your MicroSD card into the adapter that came with it.
Put the data side of the MicroSD card into the data side of the adapter.


Look for the write-protection switch on the left side of the SD adapter.
Flip the switch to the side that reads "Off."


Remove the MicroSD card from the adapter and replace it in the device you were using it with.

or you might

Feel along the lower right and left sides of the Micro SD card to find out if it has a built in write protection switch.

Move the switch over to the "On" position to turn on the write protection feature.
Check the front ports on your computer and see if it already has a built in card reading unit.

Purchase an external card reader that plugs into a USB port if your computer does not already have an internal card reader (see below).

http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&DEPA=0&Order=BESTMATCH&Description=card+reader&x=0&y=0

Plug the card reader into any open USB port on the computer.
Power on the computer and let the operating system finish loading.

Insert the card into the Micro SD slot on the card reader.
Wait for a new window to appear that will ask what action you want to take with the Micro SD card.

Click on the link that says "Open a folder to view files."
Right-click on a file if there is just one specific file you want to enable write protection for.

Click on the "Properties" link from the menu that will pop up.
Navigate to the "General" tab.

Click on the box marked as "Read Only" and then close the Properties window.
Close the window and then double-click on the "My Computer" icon on your desktop if you want to enable write protection for every file on the Micro SD card.

Right-click on the name of your Micro SD card in the list of computer drives.
Click on "OK" and then close the window.


Click on "Properties" and then navigate to the "Security" tab. Scroll down to the heading labeled as "Permissions."

Click on "Deny" under the "Write" section.

Try a different / all other USB ports on the computer, and if possible, a different computer if no USB port on your computer works with it. If it still doesn't see the drive, the drive is probably not working. If it does see the device, but is asking for drivers, provide a disk with drivers that came with the reader - or check the Sigma web site for drivers that work with you OS (Windows, Mac, etc.), download and install / extract.

If it sees the device, but doesn't see the memory card, the reader may not recognize the newer, larger capacity memory cards. SD cards are smaller than 4GB in capacity, and SDHC cards are 4GB and larger. Make sure that if you're trying to read an SDHC card that the reader SPECIFICALLY says it works with SDHC cards. Most SD readers can NOT be upgraded with firmware to be able to read SDHC cards - a new SDHC reader is required.

Good luck!

There could be many reasons for this problem..
1. The card is just too big - some readers can only cope with 2 or 4 Gb max.
2. The card's transfer rate may not be compatible - there are many differing speeds at which they can run and not all readers can cope with it.
Have you tried connecting the camer to the printer via USB? pic-bridge etc. will use the camer itself as a card reader avoiding compatability issues.
Hope this helps.

It sounds as if you have an SD card reader, not an SDHC card reader. While SDHC cards will fit into SD slots, they are electronically incompatible and will not work. SD devices are limited to cards 2GB and smaller. SDHC cards begin at 4GB and go up to 32GB.

You haven't said which camera you have, but your problem is almost certainly a hardware incompatibility. SD cards and SDHC cards look the same and fit the same slots but are technically different.

Your fix is to either stick to a maximum SD capacity of 2GB (some cameras can only cope with 1GB or smaller) or to replace your camera with a later SDHC compliant model and to use an separate (cheap) external SDHC compliant card reader on your laptop.

Has the card worked before.If it is the first time you have tried,is the SD card an SDHC,as some printers will not read these.Try a standard SD card and see if your printer reads that.Hope this helps.

Try putting a tiny piece of scotch tape over the lock slider. See if that works.

Unless the PC has a memory card reader it will NOT have one.(Usually in the slot where the floppy drive would fit) If so you are best advised to buy and external card reader.

They are quite cheap.

Is the card reader built into the computer?
I know there are a few card readers out there having trouble reading 2 gig memory cards if the computer or card reader was built over 5 years ago.
If you have a data cable for your phone and software for the phone, your computer should be able to read it that way.

Well, installing an internal card reader without a spot on the motherboard, is a little hard to do. I would suggest buying an external card reader. They are a little cheaper, and a lot easier to setup and use, since they just connect to a USB port which all computers have.