Also found this zaz:
Upgrade a Basic Disk to a Dynamic Disk
Before you upgrade a basic disk to a dynamic disk, note the following:
You must have at least 1 MB of unallocated disk space available on the basic disk that you want to upgrade.
When you upgrade to a dynamic disk, the existing partitions on the basic disk are converted to simple volumes on the dynamic disk. In addition, any existing mirrored volumes, striped volumes, RAID-5 volumes, or spanned volumes are converted to the dynamic volume equivalent.
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After you upgrade to a dynamic disk, the dynamic volumes cannot be changed back to partitions. You must first delete all dynamic volumes on the disk, and then convert the dynamic disk back to a basic disk.
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After you upgrade to a dynamic disk, local access to the dynamic disk is limited to the Windows 2000 operating system.
To upgrade a basic disk to a dynamic disk:
In the graphical view of the Disk Management window, right-click the basic disk that you want to upgrade, and then click Upgrade to Dynamic Disk.
NOTE: You must right-click the gray area that contains the disk title at the left of the Disk Management details pane, for example, Disk 0.
In the Upgrade to Dynamic Disk dialog box, click to select the check box beside the disk that you want to upgrade, and then click OK.
In the Disks to Upgrade dialog box, click Details if you want to view the list of volumes in the disk.
Click Upgrade.
Click Yes when you are prompted to upgrade, and then click OK.
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How to Manage Dynamic Disks
Dynamic disk storage supports volume-oriented disks. A dynamic disk is a physical disk that contains dynamic volumes. With dynamic disks, you have the ability to create simple volumes, volumes that span multiple disks (spanned and striped volumes), and fault-tolerant volumes (mirrored and RAID-5 volumes). Dynamic disks can contain an unlimited number of volumes.
Local access to dynamic disks (and the data they contain) is limited to Windows 2000-based computers. Dynamic volumes cannot be accessed by, or created on, computers that are configured to dual-boot or multi-boot Windows 2000 and one or more versions of Windows NT 4.0 and earlier, Windows Millennium Edition, Windows 98 Second Edition and earlier, and MS-DOS.
You create dynamic disks when you use the Upgrade to Dynamic Disk command in Disk Management to upgrade a basic disk.
Check this url for the whole content: **
http://support.microsoft.com/default...;en-us;Q308209
Hope this helps some but It's not looking like you can get the data back from that 80 gigger
/JD