What happens when you tried to plug-in SD card to the computer?
Have you made any recent changes to the computer prior to the issue?
To make the SDHC be recognized by the computer, we need to ensure that the card reader works in Windows 7 first. Please check if the card reader is recognized properly by the computer and you have installed the driver for it.
Meanwhile, you can plug some other storage cards to the card reader and see how it works.
I would suggest you to refer the link below
A Secure Digital (SD) card may not be recognized on a Windows 7 based computer.
http://support.microsoft.com/kb/981642
Uninstall all the Generic USB drivers and reinstall.
1. Open Device Manager.
2. In "Disk Drives" dropdown, uninstall the "Generic SD/MMC USB device" drive.
3. Restart computer.
4. Insert SDHC card.
Hope this helps.
Start up a computer with
Windows XP, Vista, or Windows 7. Insert the SD card into an external memory
card reader or into the computer's built in card reader. If it the first time a
SD card has been inserted into the computer, Windows will recognize the SD card
and automatically install drivers to read the memory card.
Go to the computer
view by clicking on the windows start menu icon in the bottom right corner of
the computer. In Windows 7 and Vista click "Computer". In Windows XP
click "My Computer"
Right click on the
SD drive under the computer heading. A dialog box with different options for
the drive will appear. Click on "Format" to bring up the formatting
dialog box.
Select the type of
formatting (also known as file system format). In Windows XP or Vista there are
several choices including FAT, FAT 32, and NTFS. In Windows 7 there is an added
choice called exFAT formatting. This is an improved FAT formatting type with improved
meta data capabilities. Choose the formatting type, name if the drive if
desired, check or uncheck the "quick format" option, and press the
"Start" button. When the SD card format is
complete Windows will provide a notification.
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