need help format lost memory
 

my 1gb turns to 511mb then the 511mb used a 300mb of space so now i only have a 200 mb space why. i also got a dead mp4 player i need a firmware for vimax mp4 player pls send me 1 thanks in advance

Sounds like the person who sold you your player cheated you, you have what is known as a hacked player, basically the player was altered to show that it held more memory, it probably never held 1GB, it probably held 512mb of space.

You can try and format the drive again and make sure that there is no partition made, i may be wrong.