I searched some discussion forums, and most of them said that I would have to somehow create recovery partition. This entry was disabled (yet still had GUID assigned to it, which apparently led nowhere and that seems to have been the root cause). These changes cannot be undone! MBR2GPT: Attempting to convert disk 0 MBR2GPT: Retrieving layout of disk MBR2GPT: Validating layout, disk sector size is: 512 bytes Cannot find OS partition(s) for disk 0Īfter checking logs ( %windir%/setu pact.log), it was clear it had a problem with my recovery boot option - it was going through all GUIDs in my BCD (Boot Configuration Data), and failed on the one assigned to recovery entry. If conversion is successful the disk can only be booted in GPT mode. C:\Windows\system32>MBR2GPT.EXE /convert /allowfullos MBR2GPT will now attempt to convert the default book disk. Unfortunately, it didn’t work for me as I always got “Cannot find OS partition” error. In general, this is done, so that Windows can boot in modern UEFI mode instead of old BIOS mode and to support disks bigger than 2 TB. In Windupdate, Microsoft added MBR2GPT command line tool, that lets you convert your system disk’s partition table from MBR to GPT.
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