OS X Mavericks doesn't read my usb, sd and external hard drive

Hi all,
I am using Macbook pro (Mid 2010) and recently upgraded to OSX 10.9.3. Since switching to Mavericks, I have problems with using USB, SD Card and External hard drive (Freecom Classic II). The outcome is random. Sometimes, I am able to use it for a while and then it suddenly goes away (from the finder) or it mounts and fades into grey and then disappears.
I did read through the forum and followed PRAM resetting. However, it works for the moment and when I restart or try to use these devices again (days later) I end-up facing the same issues with USB, SD and EHD.
I checked all these devices in my PC and Ubuntu. All of them works fine.
Any directions?
regards,
Martin

Might be corrupted Finder preferences ...
Open the Finder. From the Finder menu bar click Go > Go to Folder
Type or copy paste the following:
~/Library/Preferences/com.apple.finder.plist
Click Go then move the com.apple.finder.plist file to the Trash
Restart your Mac then go to Finder > Preferences > General
Make sure External disks is selected.

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OS X Mavericks doesn't read my usb, sd and external hard drive

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