Drive both GPT and MBR...

[Soogs]

I have a GPT partitioned external Seagate drive 3TB (usb2)
Decided to move the drive over to my usb3 dock but it comes up locked. 2 partitions 1.99TB and unallocated space. also comes up as MBR for some reason.

I can't do anything with the drive or to the drive... cant assign a drive letter. partition etc...

I've moved the drive back to its original enclosure to pull the data off it.

I'm just wondering what's going on here?
I'm assuming it was actually set as MBR as my NAS which has a USB port used to recognise it and recently it hasn't, making me think it has been set as MBR the whole time (even though in its original enclosure it comes up as GPT at full capacity 3TB).

Any Ideas?

 

[Snapshot]

If you've been using it with a NAS it's probably formatted as EXT3 or EXT4 which Windows won't recognise. I'd expect it to be GPT as it's >2TB.
You'll need to try diskpart from a command prompt if you want to use the PC to clear it.

 

[Soogs]

It was initially set up on a PC as NTFS and used externally.
The NAS came later and I just mounted it as an external share after formatting it with my MacBook as HFS+ or whatever it was at the time.
Haven't been able to use it on the NAS for years now no matter where I partition it (mac or pc).

for the last year, its been NTFS/GPT as its over 2TB

I'm just a little puzzled as to why it comes up as GPT/3TB on the USB2 enclosure and 2TB/MBR on the USB3 dock

 

[EsaT]

Like you have noticed both GPT and MBR can cause.
https://superuser.com/questions/1229258/hdd-appears-to-have-both-mbr-and-gpt
https://superuser.com/questions/833...ition-and-one-gpt-partition-on-the-same-drive

If you don't have any data on it that you need/data is stored also in elsewhere you could just clean all partitioning info using diskpart.

 

[Snapshot]

It was initially set up on a PC as NTFS and used externally.
The NAS came later and I just mounted it as an external share after formatting it with my MacBook as HFS+ or whatever it was at the time.
Haven't been able to use it on the NAS for years now no matter where I partition it (mac or pc).

for the last year, its been NTFS/GPT as its over 2TB

I'm just a little puzzled as to why it comes up as GPT/3TB on the USB2 enclosure and 2TB/MBR on the USB3 dock

Do you have another drive >2TB that you can try in the USB3 dock?

The links provided by @EsaT are interesting and may describe what's happening.

 

[Soogs]

Thanks, EsaT
I had to use diskpart to fix the issue after pulling the data from the drive.

working fine now.

@Snapshot I do and it works fine. It's a drive I recently pulled out of another NAS and have formatted it in the dock so all is well there.