Your clone may not have as much memory as you think. It could be one of many that are hacked to report fake information. There is a tool to verify this.
Go here
H2testw 1.4
and download the link labeled "
Direct Download Of Software For version 1.4 of H2testw"
then run it on your player. It's a windows app. There is a Mac app listed on this page too...
More explanation here
MP4 Nation Forums • View topic - Rockchip RK2608 (I think 
) says "file format error"
If it passes: then a few more questions come to mind in troubleshooting:
how much space SHOULD it have (what was it supposed to be) (1GB, 2 GB, 4, 8, whatever)?
how large does your computer say the memory space is (like 1.5 GB out of 4GB full)?
how much space do the 146 songs take up on your hard drive (not on the player)?
how much space do the 430 songs take up on your hard drive (not on the player)?