My Samsung GTS C 3312 phone does not acknowledge the peresence of the Memory Card evven though it is in the correct slot. The memory still has those files since I cross-checked it on diff mobiled and

SOURCE: write-protection

it seems like that your card is locked with some password.
this can be removed through some password recovery tool
install them in your pc and connect your memory card through
an adopter into usb port.

SOURCE: memory full but i have recently formatted it

Your problem may reside in your application "ini" files which have been corrupted or virally infected, you can try the following, please let me know if this helps.

" Normal Reset (*#7780#) : Restores ini files from rom but preserves user data (photos, 3rd party apps etc) "

Robert Nyilas

• 627 Answers
• Posted on Jul 24, 2009

SOURCE: USD HD folder Showing empty even though the HD shows as 96% full.

scan your hardrive for errors
right click on the drive click properties
at the tools tab click on check drive

Jeffrey Groves

• 573 Answers
• Posted on Feb 13, 2011

SOURCE: when plugged into my computer,

Nalon:
Assuming that you're using Windows:
Assign a drive letter for the External drive.

• Right Click on My Computer
• Scroll to Manage
• Select Disk Management
• Locate the External drive in the lower bottom Right corner, Right Click, Select Assign Drive Letter. Ok/Close

SOURCE: Weird folder/filenames that will not delete

Problem: Folders / files in USB flash drive got named with weird strange characters & those folder / files cannot be copied or deleted.

Reason: Virus infected

Solution:
1. Click on "Computer"
2. Right click on the drive that contains USB flash drive
3. Select "properties"
4. Click on "Tools"
5. Click on "Check Now"
6. Check disc options will appear on screen, put a tick mark in the box in front of Automatically fix file system errors
7. Tick mark in the box in front of Scan for & attempt recovery of bad sectors is not necessary.
8. Click on "Start"
9. Upon finishing of this task, screen will show message "Your device disc was successfully scanned" and bla bla. Close it.
10. After this process the undeletable folder in USB flash drive can be deleted by selecting it & deleting it. The contents of affected folders files cannot be recovered.

After lot of struggle I got this solution on my own by the grace of God.
Sure it will work for others too.

Thanks and regards Raju