Article ID: 2006381 - View products that this article applies to.
Consider the following scenario. You burn files or folders onto rewritable media in a Windows 7 system in "Mastered" mode (CD/DVD). That is, you burn the files or folders so that no more burning or additions or deletions are possible. In this scenario, Windows 7 explorer incorrectly reports zero used space on the media. (That is, Windows 7 explorer shows the media as being blank.)
This issue occurs because of an incorrect disk free-space calculation sequence in Windows 7.
The issue is resolved in Windows 7 Service Pack 1 (SP1). You can install Windows 7 SP1 to resolve this issue.
This problem has been reported for DVD-RW, DVD+RW, DVD-RAM, and BD-RE disks. Windows 7 SP1 resolves this issue for all kinds of disks.
Be aware that on Windows 7 earlier than SP1, although the available disk space reporting may be wrong, the actual data written to the disk is not lost.