During Setup, if you choose to create a partition that uses the remaining space on a disk, you cannot use the maximum space available on the disk.

For example, if you choose to create a 4096-MB partition on a disk that has only 4096 MB available, the actual partition that is created may be 4095 MB or less in size.

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Some space at the end of the disk is reserved by Setup in case you later want to upgrade the disk to a dynamic disk. Dynamic disk information is saved at the end of the disk. The amount that is reserved is a minimum of one cylinder, or 1MB, whichever is greater. One cylinder can be up to 8MB, depending on drive geometry and translation.

For additional information, click the article number below to view the article in the Microsoft Knowledge Base:

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This behavior is by design.

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