You can, on occasion, hit a small stumbling block when adding a new hard disk to a machine, where the disk is marked as Read-only.
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In my case, I am using the Nutanix Community edition and I have added a new hard disk to my server.
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Before I can format the drive, I have to remove the Read-only attribute.
To do this, complete the following steps:
Open a command prompt as an Administrator, type in Diskpart and then press Enter.
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Type in List Disk and press Enter.
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Choose the disk that you want to remove the Read-only attribute from. In my case, I know that it is a new disk and therefore will have Free Space. So I will look at Disk 3.
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To select the correct disk type Select disk n, in my case I will type in select disk 3 and press Enter.
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We now need to check that the attributes of the disk match. To view the attributes type in attributes disk and press Enter. You should see that both Current Read-only State and Read-only both equal Yes.
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To clear the Read-only attribute, type in attributes disk clear readonly and press Enter. You will see a cleared successfully message appear.
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In Windows, find the Disk Manager tools and you should now see the change has occurred or you may need to refresh the disks.
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You should now be able to create and format the volume.