Hi its me again. 

Thank you very much for your help on Sunday. It really worked. However, I ran into problems again. I tried to sync the Sandisk sansa c250 with a Windows Media player and after rebooting it starting acting weird and it said there were no songs in it. the empty space in settings in the player display showed some enormous number in MB. 

Today, it is acting even worse. It shows the boot screen and then that's it. 

Recovery mode seems to be working because when I lock the "hold" switch, hold the record button, and press the power button, the boot image comes up (which says Sansa and shows the picture of a reptile) and there is a prompt that says "Please connect USB". So then, I turn the lock "hold" switch to the white part to turn hold off and then i connect it to the USB with the computer. Then the prompt says 

Mini-B->Device Mode 
USB2.0 MSD 
LUN0 locked 

When I open disk utility on the computer (Mac OS X, 10.4.11), it shows up the 16 MB unformatted partition, detailed information is as follows: 


Name : 	SanDisk Sansa C200 Media
	Type : 	Disk

	Disk Identifier : 	disk1
	Media Name : 	SanDisk Sansa C200 Media
	Media Type : 	Generic
	Connection Bus : 	USB
	Connection Type : 	External
	Device Tree : 	IODeviceTree:/PCI0@0/USB7@1D,7
	Writable : 	Yes
	Ejectable : 	Yes
	Mac OS 9 Drivers Installed : 	No
	Location : 	External
	Total Capacity : 	16.0 MB (16,777,728 Bytes)
	S.M.A.R.T. Status : 	Not Supported
	Disk Number : 	1
	Partition Number : 	0

Please help me with repairing the player.