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In some cases, the drive may have been partitioned into smaller, logical partitions. If this is the case, the chance of this data being corrupt is slim, and correct Head and Sector values are readily available from these areas. To find the second partition on the drive, use the Fixed Disk Editor in Micro-Scope to view the sector containing the "55 AA" string. This sector should appear after the first VBR, so don't confuse the two. The second MBR should start on Head 0, Sector 1 of a given cylinder. Accordingly, the second VBR will appear on Head 1, Sector 1, and the FAT on Head 1, Sector 2, etc. By adjusting the first MBR in Micro-Scope so that the value for Starting Cylinder, Head and Sector is equal to the location of the second MBR, the VBR is now accessible through the Micro-Scope partition editor. Use these values to reconstruct the second MBR. The only value that will need recalculating is the Start Absolute Sector in the second MBR.
As outlined in the first article in the series, the Start Absolute Sector is the same as the value for Ending Sector. This is not the case with a second partition. The Start Absolute Sector is the number of sectors prior to the VBR. The formula for the Start Absolute Sector is as follows: (Number of Sectors) + (the Start Absolute Sector of the previous partition) + (Sectors per Track). This formula will work for any additional logical partitions.
If, during partition reconstruction, there is something not understood, e-mail the Micro 2000 Tech Support Dept. before making changes to the drive.
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