Hot answers tagged

63

On the command prompt type diskpart and answer to any possible UAC prompt. On the new diskpart prompt, type list disk. Note the Disk ### column. Type, select disk ### (with ### being the disk you wish to delete. Usually the disk with partition 0 with a size of 200 MB) NOTE: The disk may not show the 200MB partition in the disk list in Diskpart even if ...


17

I am assuming that you originally formatted these drives on an Intel Mac (OS X) system. Rather than paraphrasing what I've heard in other places I'll simply quote from the Wikipedia article for EFI System partition. On Apple–Intel architecture Macintosh computers, the EFI partition is initially blank and not used for booting. However, the EFI ...


15

The reason why you can't access it on Windows Explorer (File Explorer) is because by default it does not run with administrative privileges. If you let's say kill Explorer and execute it again from an elevated command prompt then you will have access to the EFI partition through File Explorer. First open an elevated command prompt and give the EFI partition ...


15

Solved :) The cause seems to be a strange feature in the UEFI implementation, which can also be seen in the Open Source TianoCore implementation: https://github.com/tianocore/edk2/blob/master/IntelFrameworkModulePkg/Library/GenericBdsLib/BdsMisc.c#L1425 I ultimately found it after diffing my EFI variable dumps after the last 21MB "loss" and finding ...


14

The official way of mounting the EFI partition is mountvol b: /s where b: is a drive letter of your choosing. You can remove the mapping with: mountvol b: /d You still need to launch explorer.exe with administrative privileges in order to see the mountpoint (kill explorer.exe, then launch one from an elevated command prompt)


8

There will be an extra UEFI partition on the hard drive, It may be hidden, if you can get a look at the files in the partition there will be some with an .efi file extension. Different manufactures label the partitions differently, mine is labeled "HP_TOOLS" I agree with William, all the new laptops I have seen in the last 2 years have UEFI EDIT: Another ...


8

Here are some more: -f Force rebuild extensions cache -v Verbose booting shows debug information -s Boots into single user mode (means only terminal based mode) -x Boots into safe mode -legacy Boots into 32bit instead of 64bit ...


8

No, a partition is not one and the same as a file; and Wikipedia is misleading you. That second paragraph is wrong on pretty much all points. EFI does not require any such things, and never relies upon a boot sector. If you want the gen on this, I suggest reading the actual EFI specification. It's fairly clear on what the \EFI\BOOT\BOOTxxx.EFI files are ...


8

Thank you for up voting! So i was able to add the missing links. 1. Download the OS X 10.9.1 Mavericks installer As you may noticed, the apple app store denies the installation of the OS X upgrade caused by the lack of hardware compatibility. But we want to download the installer anyways. A possible solution is to run the download enabler tool. You can ...


7

Currently it is not possible to use ATA Security with Macs, the EFI does not implement this and freezes (locks) the drive after EFI initialization. So no further ATA security manipulation can be done with hdparm or alike. Even if you circumvent the ATA freeze (which is possible) in Linux and then set a password – or set a password when the HDD is in ...


6

Googling for boot-args site:developer.apple.com gives some good resources. cpus=1 forces the system to only use a single CPU core. srv=1 is set on Xserves and machines that have Mac OS X Server installed, and supposedly changes some kernel tuning parameters for server-friendly operation. _panicd_ip=a.b.c.d Lets you specify the IP address of a panic debug ...


6

Your "hidden" 1GiB partition is a Microsoft System Reserved partition. This is a Poor Man's equivalent to a system partition. It isn't a true system partition, and it isn't an EFI System Partition. The boot manager that it contains is the Microsoft Boot Manager. However it is your system partition. Delete it and your machine will be unbootable. As ...


5

I am having problems confirming this information, but, I have personally not seen a laptop released within the last few years (non atom and latest technology) that was not EFI. The best bit of advice I can give is to write down the BIOS version/serial/manufacturer and try to Google it and see what you can find out.


5

What would happen if I delete the EFI partition and reformat as MBR partition table on an external drive not booted from? Nothing. It would still just work. But you do seem to mix EFI and GPT, so let me give a longer answer: MBR is a very old way of partitioning drives on a PC. It only allowed for four primary partitions, or, with a workaround, for 3 ...


5

You need to understand the differences between BIOS-mode (aka CSM or legacy-mode) booting and EFI-mode (aka UEFI-mode) booting. Windows ties these boot modes quite closely to the partition table type: Windows will boot in BIOS mode if and only if the disk uses the older Master Boot Record (MBR) partition table type, and in EFI mode if and only if the disk ...


4

Follow Computer> C:(or your Local Disk)> Windows > Panther In the folder look for the file called setupact. Open it and hit Ctrl+F to find the string: Callback_BootEnvironmentDetect: Detected boot environment: It will be either BIOS or UEFI.


4

If EFI/UEFI meant extra partition on the HDD, this would imply that UEFI based machines can't boot diskless, and yet they can! You can't rely on that to determine if a machine is (U)EFI capable. Furthemore, HP_TOOLS does exist on non-UEFI based installations, it is created by some extra tool (ProtectTools, BIOSUPDate, Sparekey etc), so even if you do have ...


4

The is no EFI64 firmware upgrade available. Thus, you have to stay with the 32-bit Snow Leopard kernel (but you can use 64-bit Apps anyway).


4

Long story short, it looks like the MacBook EFI 1.7 Firmware update addresses this issue, but the firmware update isn't extended to early 2008 MacBooks. Without the EFI firmware update, the emulated BIOS used for BootCamp fails when it tries to locate the SSD. This seems specific to SSDs utilizing the Indilix controllers with firmware <= v1.3. Here's ...


4

Firstly: note that while UEFI can provide faster boot times, it doesn't automatically do so; it depends on the firmware in question. Secondly: yes, you need to reinstall Windows if you want to switch to UEFI. Windows is installed in UEFI mode only if you boot the install DVD in UEFI mode. You may also need to reformat the disk, because in UEFI mode ...


4

Try not using the "All" part of selecting the firmware in BCDBoot. Had the same problem, but selected just UEFI (my machine has it) and it worked! If you have BIOS just use bcdboot c:\Windows /l nl-NL /s b: /f BIOS Or for UEFI use bcdboot c:\Windows /l nl-NL /s b: /f UEFI Tell me how that goes.


4

One way I found is to open it in the administrator command prompt: type E: then you can browse around and edit the files


4

Error 0xc000007b may relate to mismatch between 32- and 64-bit, so may be caused by 32-bit grub4dos trying to boot a 64-bit OS. The grub4dos latest release dates from 2009 and knows nothing about UEFI, so shouldn't be used. You should probably start from scratch and use the tool UEFI MULTI. The purpose of this tool is described as : Tool to format USB-...


4

You have to remove all partitions. This a limitation of Windows’ disk management. After that, you can use convert mbr. But since you have to remove all partitions anyway, clean is much faster and removes the partitioning scheme, too. And yes, this is the exact error message you’ll get on a non-empty disk: DISKPART> list partition Partition ### Type ...


4

First, you wrote: I do not have enough portable storage for backup FIX THIS PROBLEM IMMEDIATELY!!!!! I frequently see problems on this and other sites caused by people who have inadequate backups. Because of accidents or hardware failures, they lose all their personal data. That out of the way, your computer uses EFI firmware, not BIOS. One of your ...


3

The HP UEFI custom logo needs to be a 1024x768 JPG, Hplogo.jpg, not BMP as the guide suggests.


3

Subject to restrictions inherent in the way that the two partitioning schemes work, gdisk is capable of such a conversion.


3

Put an Ubuntu 13.10 amd64 CD/DVD into the optical unit and on reset bring up the boot menu. If the PC has UEFI, the boot menu will present two items for the CD, one marked as "UEFI" and another "normal" one. If you select the normal one, you will get a graphical menu, while selecting the UEFI item will give you a textual menu. See this link for screenshots: ...


3

Let's read the fine source. In block/partitions/efi.c, the place to set up gpt partitions is efi_partition(). Here decides the maximum number of partitions: for (i = 0; i < le32_to_cpu(gpt->num_partition_entries) && i < state->limit-1; i++) { num_partition_entries comes from gpt header on the disk, so the maximum number is state->...



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