Jul 04, 2013 Windows cannot be installed on this disk. The selected disk has an MBR partition table. On EFI systems, Windows can only installed on GPT disks.
- Install Snow Leopard Mbr Partition Table Gpt Partitioning
- Install Snow Leopard Mbr Partition Table Gpt Vs Msdos
Active3 years, 7 months ago
- I recently bought an install disk for Snow Leopard and before installation it tells me that It cannot install because my hard drive doesn't use the GUID partition scheme and I am not sure what to do when partitioning the hard drive-I need some step by step instructions better than the ones given to me by Apple.
- The GPT specification requires that the first 512 bytes of a disk be reserved as a place-holder, essentially containing an MBR that simply indicates one partition which occupies the whole disk, where a traditional MBR disk usually locates its partition table and boot code.
Is it a requirement for a drive to use GPT partition table if wanted use UEFI boot? Or is it still possible to use MBR partition table as format for drive's partitions and have bootloader saved in a separated EFI partition?
As I understand for now, MBR contains both, information about drive's partitions and boot loader. Consultant medical interview guide pdf. But UEFI firmware requires boot loader to be placed in separated EFI (FAT32) partition. So if UEFI firmware supports MBR format as a format for drive's partitions, everything should be ok, am I correct?
UPDATE:
Background: I have single Xubuntu 14.04 installation on SSD drive, currently it's using BIOS boot with MBR partition table type. I'd like to convert to UEFI boot, I'm wondering if it's possible to continue to safely use MBR as partition table type with separated EFI partition created for boot loader.I'm familiar with BIOS-UEFI conversation process.
Background: I have single Xubuntu 14.04 installation on SSD drive, currently it's using BIOS boot with MBR partition table type. I'd like to convert to UEFI boot, I'm wondering if it's possible to continue to safely use MBR as partition table type with separated EFI partition created for boot loader.I'm familiar with BIOS-UEFI conversation process.
Thank you for your answers!
user2694295
user2694295user2694295
1 Answer
It's theoretically possible to use an MBR partition table in an EFI-mode boot; however, almost nobody does this, so it's poorly tested. Also, in my own (brief) tests with this method, it seems to produce more problems related to boot loader naming and NVRAM entries (as managed by
efibootmgr
in Ubuntu). Thus, it's not something I recommend. The saying 'if it ain't broke, don't fix it' probably applies to your case -- you say you'd 'like' to convert to EFI-mode booting, but you've provided no reason for this. In the absence of such a reason, I'd say it's inadvisable to do the conversion, since nothing's 'broke.'Also, if you set up an EFI-mode boot from an MBR disk, I can't promise that future Ubuntu updates will like it. It's conceivable that the Ubuntu installer or update process would choke, possibly creating serious problems down the line. OTOH, it all might go just fine. That's part of why 'untested' in this context translates to 'you probably don't want to try this' -- there are just too many unknowns, both now and in the future.
That said, if you must do such a conversion, you can certainly try it with an MBR partition table. If you run into problems with NVRAM entries not 'taking,' you should then do an MBR-to-GPT conversion. Alternatively, you can just plan to do the conversion from the start. See my Web page on the subject for details. Note that partition table data structures are actually quite simple, and the conversion requires no changes to filesystems. Thus, the odds of a catastrophic failure are quite low. If you use
Rod SmithRod Smithgdisk
, a problem is most likely to turn up when the program loads the MBR data structures and converts in memory to GPT. At this point, you'll be warned, or at least be told of the problem if you do a disk verification (v
in the main menu), so you can abort the operation before writing anything back to disk. OTOH, no partitioning operation is entirely risk-free, and if a problem does occur, it can be catastrophic, so having backups is wise.36.6k44 gold badges4343 silver badges7272 bronze badges
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Master Boot Record (MBR) disks use the standard BIOS partition table. GUID Partition Table (GPT) disks use Unified Extensible Firmware Interface (UEFI). One advantage of GPT disks is that you can have more than four partitions on each disk. GPT is also required for disks larger than two terabytes (TB).
You can change a disk from MBR to GPT partition style as long as the disk contains no partitions or volumes.
Install Snow Leopard Mbr Partition Table Gpt Partitioning
Note
Before you convert a disk, backup any data on it and close any programs that are accessing the disk.
Note
You must be a member of the Backup Operators or Administrators group, at minimum, to complete these steps.
Converting using the Windows interface
Install Snow Leopard Mbr Partition Table Gpt Vs Msdos
- Back up or move the data on the basic MBR disk you want to convert into a GPT disk.
- If the disk contains any partitions or volumes, right-click each and then click Delete Partition or Delete Volume.
- Right-click the MBR disk that you want to change into a GPT disk, and then click Convert to GPT Disk.
Converting using a command line
Use the following steps to convert an empty MBR disk to a GPT disk. There's also a MBR2GPT.EXE tool that you can use, but it's a little complicated - see Convert MBR partition to GPT for more details.
- Back up or move the data on the basic MBR disk you want to convert into a GPT disk.
- Open an elevated command prompt by right-clicking Command Prompt and then choosing Run as Administrator.
- Type
diskpart
. If the disk does not contain any partitions or volumes, skip to step 6. - At the DISKPART prompt, type
list disk
. Note the disk number you want to convert. - At the DISKPART prompt, type
select disk <disknumber>
. - At the DISKPART prompt, type
clean
.NoteRunning the clean command will delete all partitions or volumes on the disk. - At the DISKPART prompt, type
convert gpt
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Value | Description |
---|---|
list disk | Displays a list of disks and information about them, such as their size, the amount of available free space, whether the disk is a basic or dynamic disk, and whether the disk uses the Master Boot Record (MBR) or GUID Partition Table (GPT) partition style. The disk marked with an asterisk (*) has focus. |
select diskdisknumber | Selects the specified disk, where disknumber is the disk number, and gives it focus. |
clean | Removes all partitions or volumes from the disk with focus. |
convert gpt | Converts an empty basic disk with the Master Boot Record (MBR) partition style into a basic disk with the GUID Partition Table (GPT) partition style. |