If you have a Windows NT 4.0 guest with a SCSI virtual disk, you cannot add both an additional SCSI disk and an IDE disk to the configuration.
1. Open the virtual machine settings editor (VM > Settings) and click Add. The Add Hardware Wizard guides you through the steps to create your virtual disk.
2. Click Hard Disk, then click Next.
3. Select Create a new virtual disk, then click Next.
4. Choose whether you want the virtual disk to be an IDE disk or a SCSI disk.
5. Set the capacity for the new virtual disk.
If you wish, select Allocate all disk space now.
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