The error ‘The specified disk is not convertible’ implies that the disk that the MBR disk is not convertible to GPT. Since this error is related to MBR and GPT partitioning, it is important to understand what these terms indicate and what are they used for.
Difference between MBR and GPT partitions
A partition is a small logical division on a hard disk. A partition table is a table that contains details about the different partitions on the disk. There are 2 types of partition tables; namely MBR and GPT. MBR is an old method of partitioning that is still in use even today. Some disadvantages of MBR are that it supports hard disk sizes of only 2 TB and it doesn’t allow more than 4 partitions on the disk.
GPT, on the other hand, is a new method of partitioning that allows you to create an almost infinite number of partitions on the disk (but Windows limits it to 128) and one partition can have about 256 TB space. Another advantage of using GPT style is that it stores multiple copies of boot and partitioning data. So even if this data is corrupted, GPT is capable of recovering it easily, which is not possible with MBR.
Error ‘The specified disk is not convertible’ when converting MBR to GPT
Due to the advantages of GPT’s offer, you may need to convert your MBR disks to GPT. And in order to convert MBR to GPT, users often make use of the Disk Management tool. Although it works in most cases, it may fail in some cases and result in errors like ‘The specified disk is not convertible’. This is often due to not clearing the disk before beginning the MBR to GPT conversion or some errors during the conversion process.
You will find detailed instructions below on how to overcome this error and convert the disk from MBR to GPT using a command line tool called DiskPart.
Use the command line Disk Management tool called ‘DiskPart’
To enter Command Prompt, just type ‘cmd’ on the taskbar and right click on Command Prompt icon. Then click ‘Run as Administrator’
When the command prompt opens, follow the instructions below:
Type ‘diskpart’ and hit Enter
Type ‘list disk’ and hit Enter
In the list of disks, note down the disk # of the disk you want to convert
Type ‘select disk #’ (where # is the disk # you want to convert to GPT) and hit Enter
Type ‘clean’ and hit Enter
Then type ‘convert mbr’ and hit Enter
Now the process of converting from GPT will begin. Once the process completes, your MBR disk will be ready. If you’ve tried this method and you continue to receive the error ‘The specified disk is not convertible’, then you can make use of free tools like ‘GParted’ to do the job for you.
GParted is a free tool that is a good alternative to the Windows built-in tool as it is specially designed for disk management operations such as creating or deleting a partition, converting from MBR to GPT etc.
Before you perform any disk related operations such as creating or deleting a partition, converting from MBR to GPT or any such thing, it is advised that you have a complete backup of your system. This is because these operations will delete all data on the disk.
If you’ve encountered data loss after a disk related operation and no backup is available, then there are data recovery tools such as Remo Recover that can recover the lost data for you. This software is capable of recovering all kinds of files like documents in various formats, images, videos and such. This tool can also be used to recover files lost due to MBR corruption. In such cases, if an entire partition has to be recovered, the tool does so very diligently by making sure the original structure of files and folders along with file names are maintained. You can also use this tool to recover data from GPT protective partition.