Windows 10: MBR to UEFI conversion

When attempting to convert my 500 gb Western digital Black from Win 10 version 1909 MBR to UEFI using Microsoft's recommended procedure I keep getting, during validation attempts, the error message that the disk cannot be validated for conversion, and file size is 512 bytes. MBR is on the disk, and Crystal Disk reports no disk problems. Any suggestions?

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Windows 10 & 7th gen Intel Core processors in UEFI mode running on MBR partitions

Hi John,

MBR partition is for older laptops but there's a workaround for it. It is to convert MBR to GPT. In this case, you can use a disk partition management. Try these steps:

• Click "Start Menu" > input "diskpart" in the search box and press "Enter" > Click "Yes" to open command prompt.
• Type "list disk" and press "Enter".
• Type "select disk n" and press "Enter". n is the number of the disk you want to convert. (take "Disk 1" for example)
• Input "clean" and press "Enter" to delete all partitions or volumes on the selected disk.
• Type "convert mbr" and press "Enter" to complete the conversion from GPT to MBR format.

Inform us for any updates regarding your issue.

 

conversion from GPT to MBR ..of free allocated drive

Hi,

For better assistance with your conversion of volume from GPT to MBR issue, we suggest posting it in our Microsoft TechNet
forum.

Please post back if you have any Windows concerns for further assistance.

 

MBR to GPT Conversion help

Partitions are not MBR or GPT. Physical disks are MBR or GPT. To talk about a partition being GPT or MBR is impossible. To talk about C drive, D drive, E drive, etc being MBR or GPT is impossible. Also, a GPT disk is NOT required to boot in UEFI mode. UEFI can boot from a GPT or MBR disk.

Physical disks are MBR or GPT:

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Each disk can have multiple partitions. The partitions are not MBR or GPT. The partitions may contain file systems and drive letters:

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We have no idea what @tushar4544's system consists of. Is it one physical drive with multiple partitions assigned to multiple drive letters? Is it multiple physical drives? Which physical disks are MBR or GPT? We don't know. We don't have enough information to offer valid advice.

Also, a GPT drive is not a requirement to boot in UEFI mode. UEFI can boot from an MBR or GPT disk. However, to boot in legacy BIOS (CSM) mode, the system drive must be MBR.