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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.
If neither your computer nor your camera will recognize your card then it is safe to say that there is an issue with the card. You may either have bad contacts or an internal issue, but since your camera states it is locked when you say it is unlocked that would normally signify an internal issue. If you still have a warranty on the card I would suggest you take it back to the place it was purchased from.
You problem is most likely to be the fact that your micro chip is a HC chip. HC chips have a new program that is not backwards compatible to regular sd host ports. This is a simple fix, however. If you don't trust downloading programs for it on the internet, just go to target or walmart and get a USB SD card reader, and a SD adapter if you don't already have one. The usb adapter should only be like $10 at most.
I had the same problem with Windows 10. Go to manufacture on your computer for SD card and reinstall the drivers..it should work fine..remember whenever dealing with Windows you may have to reinstall drivers...
I'm having the same problem with a Transcend 4GB microSDHC card / microSD adapter. I have also found it probably has something to do with the card reader...either the card reader is an SD card reader trying to read an SDHC card OR the card reader is not able to read high-gigabyte SD cards (over 1 GB in some cases).
The Card Reader you are using is probably not compatible with SDHC Memory Cards (High Capacity SD). You may need to get an SCHC compatible reader or check the website for your product to see if the is a driver update. You can get a new reader for about $20 bones if needed. I had the same issue.
When You Insert your SD card into the internal card reader, then the SD card is not recognised by the system and the SD card drive doesn't show there. The problem can be because of driver issue, system issue and device issue. To fix the problem you need to go at device manager if there is a yelllow sign in SD card controller, the problem is most probably caused by a driver issue. Then you need to update the driver. You can also download the driver for your card reader.
Also, check if your SD Card is broken. You can also check it into different devices port.
If it is detected then you can backup of your data.
If the problem not resolved by any means and you require you SD Card data then I will suggest you read - https://www.stellarinfo.co.in/services/removable-media-recovery.php