Hello,
Connect your SanDisk Sansa M230 to your computer again. Ignore the format message and go to My computer icon on your computer, right click on the drive (E:or F: or G: etc) representing your SanDisk Sansa M230, scroll to format allow it format from there.
If it still refuses to format, you can the reset the SanDisk Sansa M230and try again.
In case you don't know how to reset your SanDisk Sansa M230, read the info on the below link on how to reset your SanDisk Sansa M23;
http://www.fixya.com/support/r6977146-reset_different_models_version_san_diskI hope this helps.
Good luck.
descarga firmware Sansa-m230
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