How can I delete files on DVD ROM disk?

Shegzy4 P September 14, 2013
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I transferred some files into a 4 GB disk I bought. After restarting, I checked the disk and couldn’t find what I transferred, so I decided to format it. It did format but the spaceĀ  of what I wrote the first time was not reclaimed. How can I permanently delete files on this disk?

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