All Questions
564
questions
129
votes
3
answers
503k
views
What is the difference in "Boot with BIOS" and "Boot with UEFI"
Now Windows 8 supports the UEFI bootloader and I have read that its different from the BIOS, but it's unclear to me after many searches on the Google.
Some points in mind are below:-
As we all know, ...
- 15.8k
91
votes
5
answers
233k
views
Linux on UEFI - how to reboot to the UEFI setup screen like Windows 8 can?
makeuseof.com explains that Windows 8 certified hardware has a new way to enter the UEFI setup screen (equivalent to BIOS). From How To Access The BIOS On A Windows 8 Computer:
No longer do we ...
- 3,375
50
votes
2
answers
510k
views
What is CSM option
What is the CSM option in BIOS? If I can't boot into Windows any more, is it because CSM is disabled?
Would an ASUS K55 come with this option diabled?
- 509
30
votes
4
answers
283k
views
What exactly is "UEFI with CSM" boot mode?
Under this question, I was told that "UEFI with CSM" is essentially BIOS mode. It made me quite confused because what I've learnt over the years is far from that.
As per my observation, I think CSM ...
- 11.3k
26
votes
1
answer
131k
views
Should I install an OS using UEFI or BIOS (legacy/CSM) boot mode? [duplicate]
I'm installing a new operating system on my computer. Should I install it for booting in UEFI or legacy (BIOS/CSM) mode? What are the advantages or disadvantages to using one or the other?
- 461
25
votes
6
answers
86k
views
How to know if my BIOS supports UEFI?
I recently bought a new Dell notebook for my girlfriend and I want to know if the computer comes with a UEFI BIOS, unfortunately I didnt find any information in the manual or on Windows, is there some ...
- 30.5k
22
votes
2
answers
9k
views
Why don't PC makers lock the bootloader? [closed]
Mobile phone makers always lock their device's bootloader - that is, they prevent you from getting root access to your device, or uninstalling the default operating system and installing something ...
user859885
21
votes
7
answers
86k
views
How to tell if the Windows Installer boots in EFI or BIOS?
I have a Windows 7 x64 install USB and want to know if the installer has booted into EFI or BIOS mode.
I found a solution here, but it doesn't work since notepad couldn't find:
\Windows\Panther\...
- 363
21
votes
7
answers
29k
views
Is there any way to boot Windows 7/8 using BIOS on GPT?
I'd like to know if there's a method to get Windows 7 or Windows 8 Developer Preview to install to a GPT disk on my traditional IBM PC BIOS setup. Windows 7, of course, rejects my GPT partition, ...
- 602
20
votes
1
answer
4k
views
What hardware device used to eat up 1.4GB of my 4GB RAM, and now suddenly after no hardware changes eats up 2.2GB?
This is more or less a continuation of
What hardware device eats up 1.4GB of my 4GB RAM?
While I have more or less accepted the solution there that for some mysterious reason, after a BIOS upgrade ...
- 3,437
19
votes
1
answer
103k
views
How do I "Boot to UEFI shell"?
I am trying to follow some instructions to update some firmware:
x64 UEFI environment:
Boot to UEFI shell
Run update.nsh
I don't know how to do this. When I boot, do I have a choice to boot to UEFI ...
- 2,237
17
votes
7
answers
86k
views
How to move an existing installation of Window 7 64bit to UEFI (from legacy)
I have a laptop that has Windows 7 64 bit Enterprise edition. It is already filled with plenty of Software and drivers.
The laptop (Dell E6220) supports booting through UEFI, but the insatllition was ...
- 173
16
votes
3
answers
11k
views
Is TianoCore+coreboot a true open source UEFI?
There has been a lot of controversy surrounding UEFI, but like it or not, it's becoming the only option when it comes to generally available desktop motherboards. I've been avoiding UEFI mobos for ...
- 272
16
votes
5
answers
24k
views
Do hard drives need a GUID partition table (GPT) to boot in UEFI mode?
Is EFI booting something hardware specific? I have a desktop motherboard with a UEFI Bios, but I can only boot from USB drives in "UEFI" mode. Both the DVD drive and the HDD's (a RAID 0 array) boot ...
- 663
15
votes
2
answers
22k
views
Is a hybrid Linux USB-Stick for UEFI & legacy BIOS possible?
my idea is to create an USB-Boot-Stick with Lubuntu that is able to boot on an older BIOS Laptop and an newer UEFI Systems.
This would be quite easy, when the Stick would be setup as a legacy boot ...
- 1,905
15
votes
5
answers
48k
views
Possible to install 64-bit Windows on 32-bit UEFI?
I recently purchased an HP Stream 7, which I was led to believe would have Windows 8.1 64-bit installed. However, it has 32-bit Windows, even though it has a 64-bit processor. Installing 64-bit has ...
- 272
14
votes
5
answers
8k
views
On consumer grade laptops what is the significance of “RAID ON” option in the firmware?
On few consumer laptops I have noticed that the laptop’s firmware provides an option for RAID.
Firmware -> SATA Operation -> RAID ON or AHCI (AHCI and RAID ON are mutually exclusive)
The ...
- 350
14
votes
3
answers
36k
views
Is it possible to update BIOS to UEFI?
I just ran the Windows 8 Upgrade Assistant on an older machine (just for fun) and was informed that due to lack of UEFI firmware, Secure Boot would not be supported.
Is it possible for motherboard ...
- 56.6k
14
votes
1
answer
73k
views
System found unauthorized changes on the firmware
I have a PC with an Asus motherboard running Windows 7 Pro.
Yesterday I installed latest Windows updates, restarted, and shortly afterwards hibernated the machine.
This morning on un-hibernating I ...
- 313
13
votes
1
answer
46k
views
UEFI with MBR partition table?
I want to convert the current GPT partition table to MBR on my laptop which uses UEFI.
Is it safe it use UEFI with MBR partition table?
Maybe I am misunderstanding about UEFI/GPT things?
- 153
12
votes
3
answers
21k
views
My new Acer Aspire 7 doesn't have a Legacy Boot option, what can I do to get it?
I am greatly disappointed by this fact, as I need Legacy Boot in order to boot into Linux OS via an USB port. Well, I only have UEFI.
I've considered two options thus far:
I install Linux distros in ...
- 321
12
votes
3
answers
34k
views
How to activate sleep states after Windows 10 install
I have just bought a new PC from a PC Builder, but they disabled all the power savings settings in the BIOS, and I think that affected the ability to use any of the sleep states because that was the ...
- 265
11
votes
2
answers
11k
views
How to make bootable Debian usb drive that works on both BIOS and UEFI systems?
I want to make bootable USB drive with Debian and make it bootable on both BIOS and UEFI systems. I've found only separate instructions for BIOS and UEFI systems. Please help me to find a solution.
- 61
10
votes
7
answers
30k
views
How can I use TrueCrypt under windows 8.1?
I know that TrueCrypt doesn't support windows 8 because some systems have UEFI enabled. It seems that if UEFI is disabled or Windows 8 is installed on an non UEFI system TrueCrypt just works fine in ...
- 101
10
votes
2
answers
88k
views
What is a "UEFI-bootable" USB flash drive and can I boot it on legacy BIOS?
I've learned the difference between UEFI and BIOS, and it seems that BIOS only boots MBR hard drive while UEFI only boots GPT hard drive. And UEFI cannot boot normal USB flash drive so I have to make ...
- 263
10
votes
6
answers
109k
views
SATA Devices not showing up when in UEFI mode
I'm trying to install Windows and the bios should be set to UEFI mode. The problem is that all SATA devices aren't showing up (shows as if there aren't any) so I can't boot from the installation CD (...
- 151
9
votes
3
answers
17k
views
Trying to understand linux support for 4TB hard disk drive on legacy BIOS
I want to add a 4TB hard disk drive for data storage only. My current configuration:
Intel Server Board S3210SH (Legacy BIOS, 2009/05/22)
Running Arch Linux.
Installed in a Crucial 512MX SSD
...
9
votes
1
answer
5k
views
How does UEFI detect boot devices in partitions?
How does UEFI detects boot devices ?
If I just install linux on some partition, say /dev/sda2, how does the uefi will be able to recognize it as boot entry ?
Does BIOS checks every partition ? How ?...
- 271
9
votes
2
answers
6k
views
Does there exist a BIOS emulator for UEFI?
What I'm wanting to do is somehow run BIOS-only OSes on computers that do not support BIOS booting or CSM. Does there exist an efi application that I can chainload that can act as some kind of ...
- 299
9
votes
1
answer
39k
views
UEFI vs non-UEFI options in boot menu
I just built new PC based on Asus Z87-Plus motherboard and in BIOS boot menu I now have my removable devices listed twice - once as a device itself and once with "UEFI: " prefix.
It looks like this ...
- 709
8
votes
4
answers
25k
views
Will my computer be able to run Windows 8 without UEFI?
Will I be able to run windows 8 on my system, even though I am not using UEFI? Is there a work around if I don't want to use UEFI?
- 1,526
8
votes
1
answer
10k
views
How to detect whether a UEFI booted linux machine's video mode is graphics output protocol (GOP) or universal graphics adapter (UGA)?
UEFI firmware appears to support GOP or UGA graphics protocols. GOP is newer and has replaced UGA. On my machine which does not have an integrated graphics adapter (only a discrete graphics adapter ...
- 389
8
votes
2
answers
80k
views
After Windows 10 upgrade I can no longer access BIOS
I posted a question recently regarding my Windows 10 upgrade which ended up with a black screen and cursor. QUESTION
I reverted back to Windows 8.1 using the "Revert to previous build" option in ...
- 251
7
votes
3
answers
93k
views
How to force my way into BIOS/UEFI?
I am trying to fix a computer whose Windows 10 will not boot any more because it gets stuck in the automatic system repair loop.
I am trying to boot that computer from a USB storage - however, for ...
- 830
7
votes
4
answers
90k
views
Windows License stored in UEFI/BIOS
Since Windows 10 (or earlier?). It has become standard to store the license product key in the UEFI/BIOS.
I am in the market for buying a new (custom build, individual parts) PC with a new Windows 10 ...
- 73
7
votes
1
answer
10k
views
How is UEFI pronounced? [closed]
UEFI stands for unified extensible firmware interface. Most people know about BIOS (Basic Input/Output System) and to my knowledge pronounce it universal as 'by-ohs'. I've looked around for the ...
- 543
7
votes
5
answers
23k
views
I get a red bar when trying to install windows 7 DVD, and it freezes
I get a red bar when trying to install windows 7 DVD, and it freezes.
I read here https://social.technet.microsoft.com/Forums/windows/en-US/aee2b86b-ab1d-409a-b8ca-e0f6a4c90b3c/windows-7-pro-...
- 24.3k
6
votes
3
answers
3k
views
Construct an open hardware laptop without Intel Management Engine (ME)
The Free Software Foundation offers a laptop that is 100% open hardware
The Libreboot T400 is a refurbished and updated laptop based on the Lenovo ThinkPad T400... in order to achieve the Free ...
- 5,032
6
votes
1
answer
3k
views
Getting UEFI BIOS boot order consistency when attaching/removing USB?
I'm trying to use a USB to determine which OS should be loaded; i.e. when the USB is plugged in, Windows should load, and when it's not plugged in, Ubuntu should load. Booting from respective media ...
- 125
6
votes
5
answers
46k
views
Can't get into the BIOS/UEFI or see boot output on DisplayPort, but can on HDMI (ASUS Maximus IX Hero)
Per the title, this is the extent of my problem. When booting this system, there is no output on the screen (or even a signal - the monitor goes to sleep) until Windows comes up and shows me the login ...
- 4,772
5
votes
2
answers
7k
views
is bootloader and bootmanager same thing?
NTLDR in case of BIOS MBR is called boot loader. can we called it as boot manager? are these two things same?
I never seen anything like BootManager while doing R&D on BIOS MBR but it came up in ...
- 189
5
votes
2
answers
14k
views
What does the "Memory Clear" functionality mean in ASUS motherboards?
In my MB's UEFI settings, there's this option called Memory Clear, under North Bridge Settings. Possible values are Enabled and Disabled.
Some models featuring this option:
ASUS CROSSHAIR V FORMULA-...
- 1,577
5
votes
4
answers
2k
views
How do I get my system to find a "buried" MBR?
Following a botched Linux install, my Windows 7 install can't find my MBR normally. It's in there -- somewhere -- and I CAN access it if I use F12 during boot to access the mobo boot options:
Note ...
- 387
5
votes
2
answers
68k
views
How do I turn secure boot off in UEFI BIOS on an ASUS TUF Gaming board?
I've tried following various tutorials. The closest one to displaying similar screens as I have was this: https://www.technorms.com/45538/disable-enable-secure-boot-asus-motherboard-uefi-bios-utility
...
- 885
5
votes
2
answers
103k
views
LENOVO desktop computer only boot with F12
I have a new desktop computer: a LENOVO model 3493-BFG with Windows 8.
I started the computer without any problem. Once Windows was automatically set up, I created a recovery media (an USB hard-drive)....
- 1,043
5
votes
5
answers
3k
views
Does UEFI run on top of BIOS?
This page: https://wiki.osdev.org/UEFI and few others which are rather creditable mention that UEFI is kind of an application which run on BIOS (legacy BIOS) and not a firmware If I got it right. Some ...
- 153
5
votes
3
answers
23k
views
Cannot save boot order in BIOS
I have a weird problem - on my Lenovo Z570 I cannot change the default boot order.
I am trying to load a bootable DVD and I have two hard drives. The boot sequence has the DVD drive as last, but when ...
- 243
5
votes
1
answer
28k
views
How to boot POP! OS in UEFI mode without disabling secure boot on my computer?
I installed POP! OS on my laptop a few days ago but secure boot wont let me boot it. I cant disable secure boot or UEFI mode because after installing a bios update my BIOS setup menu wont open anymore....
- 63
5
votes
2
answers
7k
views
How to take screenshot of your UEFI Bios?
I never really needed it, but now that I'm starting to overclock, I'm curious. I've seen people posting their actual screenshots, not pictures from camera, from their UEFI Bios.
How can I do that?
I'...
- 6,501
4
votes
2
answers
15k
views
"Ghost" blank UEFI entry in Gigabyte BIOS
Background
I was trying to install macOS (Hackintosh) alongside Microsoft Windows 10 on my SSD, so I shrank the Windows partition using Disk Management and left an empty exFAT partition next to C: (...
- 1,041