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MBR vs GPT on system drive

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System currently running Windows 10 and using ATI 2016 trial.  my system drive based on diskpart and gparted shows that it is an MBR drive.  I have read most stuff about MBR and GPT in these forums and other forums that GPT is the way to go since it can handle more partitions, larger than 2gb drives and less prone to corruption.  But I still can't get it.  Not sure if my firmware is UEFI capable but there are times that my optical drive shows twice on the boot menu if I boot from a bootable CD - shows EFI cd drive and just cd drive, so I assume EFI cd drive means that I have a UEFI firmware - if somebody can confirm this for me.  Why will EFI cd rom show on a boot menu?

Currently, I only have a system drive 1TB and looking at diskpart it does not say GPT so I assume it is MBR.  Now I do a system backup using ATI 2016, so I assume also is MBR.  Can I convert my system disk to GPT to get the advantages after the MBR backup?  If it is now converted to GPT and after say a week, I didn't want a program that I installed or had some virus and want to restore from an MBR backup, will that mess up my system drive and make my system unbootable?

In some of my readings, they say boot using legacy mode or boot using UEFI - how do you actually select do that?

If I currently have a data drive, since I will be purchasing a 2-bay usb 3.0 drive and slap in 2-2TB new hard drives.  I assume here that a disk partition program that I can use to create GPT drives.  Will there be any conflict if there is a mixture of MBR and GPT drives.  I only want GPT for data drives.

I hope I didn't confuse anybody, but I myself is so confused now. 

Appreciate all your help.

 

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Georgie, you may like to take a look at the following post on the subject of MBR and GPT / UEFI etc.

https://forum.acronis.com/forum/101550

You will need to check with your computer manufacturer support website as to whether your system firmware is UEFI capable but you could start checking by going into your computer BIOS and look at the settings options given there.

The method of accessing BIOS will depend on your computer make, model and BIOS manufacturer, but common access keys include pressing ESC, F1, F2 or DEL keys when the system is first turned on - look for some text being shown on the bottom line of your display at the same time that may give you key options.