I have a new 4TB external HDD and a non-UEFI BIOS. MBR or GPT?

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I plugged my new Western Digital 4TB external drive into my old PC, and it is a MBR HDD. The PC is too old to have UEFI. I want the drive to be as reliable as possible and to work on my new (UEFI) PC as well. Should I convert it to GPT now?
 
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You can run any drive as GPT except as a boot drive on a Legacy system.

Does the WD drive already have some type of software to allow access to all 4 TBs?

Without special software, in order to access the full drive you need to set it to GPT, but again, it may already have some software which does that.

Do you have a model number for the external drive?
 

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