HOLDON.bin is ok. It is generated when you stop playing songs it stores the resumed song position.
To get random just play a song, then press and hold the back button and you will get a popup menu, just select play mode / shuffle.
Remove the "autorun.inf" file, it is used to launch the virus. Make sure you keep your firmware backup safe. You can try other firmware, but 90% chance it doesn't work.
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