We will see how we can delete the EISA Partition?
So lets see the steps
You can login to server and open diskmgmt.msc and now you can see in Disk 0 there are two partitions one is EISA and another is C drive.
Open Command prompt and start diskpart
After selecting the disk 0 you need to ensure that you have selected the correct disk, so you need to run List Disk again to identify the astrix mark just before the disk as below in the image
Now you can see just running the above command, the partition is now deleted as in the below image
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