chrishoffman — 2014-07-28T06:40:58-04:00 — #1
Originally published at: http://www.howtogeek.com/193669/whats-the-difference-between-gpt-and-mbr-when-partitioning-a-drive/
Set up a new disk on Windows 8.1 or 8 and you’ll be asked whether you want to use MBR or GPT. GPT is the new standard and is gradually replacing MBR.
adriank_it — 2014-07-28T10:39:09-04:00 — #2
32-bit Win 8.1 boots from GPT.
dalchina — 2014-07-28T10:39:33-04:00 — #3
I'm wondering at what point you discover (without checking an article like this) that, say, installing Win 8 32 bit on a GPT formatted disk won't work? Or that you can't install Win 8 64bit on a GPT formatted disk using a non-UEFI BIOS? There are two cases in the latter situation: 1: trying to format a HDD as GPT on a non UEFI system using a boot disk, say. 2: Installing a preformatted HDD in a non UEFI PC, and then trying to install the O/S.
I guess whoever thought up the name could be Scottish- 'guid' = 'good'. Certainly not French. I mean, try saying 'GPT' in French.. clue, it's a verb in the present perfect - J'ai ......
Oops! Quel marketing!
wilsontp — 2014-07-28T11:49:38-04:00 — #4
@dalchina, Normally, you'd discover this while you're setting up Windows; if you're setting up on a new machine, the "Select an installation location" stage isn't going to let you partition the drive with an incompatible partition scheme. In the case of a formatted drive, you should also get an error during the setup process. In either case, you should know about the problem before any data is modified, so you can copy that data over to an MBR drive.
tmcclary9 — 2014-07-28T22:28:00-04:00 — #5
My newer laptop came with UEFI and a secured boot-loader. I wanted to dual boot Windows 8 and Windows 7. Had to disable secure boot-loader by formatting and switching to MBR with 3rd party partitioning software. Too bad one couldn't just make a partition in windows 8 disk management for windows 7 and have everything work. Could not get windows 7 to boot in UEFI. After installing windows 7, I had to reinstall windows 8. What a pain.
planetchetwynd — 2014-07-29T10:32:40-04:00 — #6
If each hard drive will be uniquely identifiable, are there any privacy issues with this?
Will it mean that it could be used as evidence like an IP or MAC address and will the GUID be accessible externally, as another way of identifying an individual for marketing, cookies etc
wilsontp — 2014-07-29T11:10:47-04:00 — #7
You couldn't just turn off the secure bootloader?
dallasyo — 2014-07-29T14:35:43-04:00 — #8
typo "strong so long" instead of "string so long"
phoebeann — 2014-08-01T07:39:47-04:00 — #9
So... starting with a 32-bit Windows 7 installation on a 1TB hard drive running on a UEFI BIOS, how would you transfer the OS to an SSD? I'd like to format the SSD as a GPT drive and clone the OS to it, thus avoiding reinstalling the OS.
wilsontp — 2014-08-01T11:24:30-04:00 — #10
You won't be able to do that with a 32-bit version of Windows 7. You either need to partition your drive with MBR or upgrade to a 64 bit OS.
Can Windows 7, Windows Vista, and Windows Server 2008 read, write, and boot from GPT disks?
Yes, all versions can use GPT partitioned disks for data. Booting is only supported for 64-bit editions on UEFI-based systems.
phoebeann — 2014-08-01T14:58:28-04:00 — #11
Thanks; I screwed up my problem statement. We have a new 64-bit, UEFI Windows 7 HP machine, and want to reformat an existing (64-bit, MBR SSD) drive as a GPT drive, and then transfer the running OS (on a 1TB GPT HDD) to the SSD, without having to reinstall the OS.The BIOS lists the legacy (64-bit, MBR SSD) drive in its list of boot devices, but refuses to allow you to make it the default.
wilsontp — 2014-08-01T15:46:52-04:00 — #12
Okay, that's different.
There are usually two modes for imaging programs: partition mode and whole disk mode. I think what you want to do here is use the whole disk mode; that should let you copy over all of your partitions, including the HP recovery partition, without any problems. I haven't actually done an image copy on a GPT drive yet (the last one I did was an MBR partition on my desktop, which has UEFI but is running in BIOS emulation mode.)
Here's a forum post over on Tom's Hardware: this guy found a program from Paragon called "Migrate OS to SSD" -- http://www.tomshardware.com/forum/id-1670056/successful-clone-windows-hard-drive-ssd-gpt-uefi.html
ray_c — 2014-08-03T23:19:36-04:00 — #13
I think the best way is do it in dos. Delete all the partitions using fdisk and the run
fdisk /mbr. That would put the disk back to the master boot record @ factory settings.
Sorry I'm old LOL
system — 2014-08-07T06:41:06-04:00 — #14
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