Xperia X10 Mini Videos & Images getting lost after reboot

[Armoured]

Hi,

I am using Xperia X10 mini and facing a problem of videos & images getting lost after I reboot my phone. Before reboot, I can find these images in the DCIM folder of the SD Card. But if power fails or device is restarted, all the images are gone.

Also, I have some music files (mostly mp3s) on the SD card, cannot find a way to add these files in the music library, and the music player always tells me that the library is empty.

Do note that it was Orange before, & I got it unlocked by some vendor in the market and now its working fine with DiGi & Starhub. Can someone help me?