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Questions tagged [operating-systems]

The layer between your hardware and software. It manages disk input/output, memory allocation, graphic acceleration, hosting device drivers and various other resources.

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windows 8.1 doesn't show in grub dualboot ubuntu/windows

So i installed ubuntu(18.10 )to be in a dual boot with windows 8.1(previously installed around 2016), but now windows does not show in grub. The partition is still there and i can access the files ...
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1answer
22 views

Why does Firefox insert a space after special characters when using a font-face?

When browsing a website that uses accented characters (or special characters) and a css font-family feature, Firefox inserts a white space (not a real space character) after the accented character. ...
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4answers
118 views

Computer ports like 22, 25, 80, 443 and 3306, are they of the motherboard or of the operating system?

As far as I know as of 2018 some of the 65535 available ports has at least one of what's called a "port proto"; I know 2 such protocols; TCP and UDP, while TCP is the mainly used one. If I'm not ...
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1answer
12 views

Can I undo a `sudo chown -R /` on Mojave? [duplicate]

I ran a command that ended up executing as sudo chown -R / Can I revert / to default permissions?
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1answer
31 views

ISO-Image Format is used instead of others? [closed]

I have seen almost all operating systems and large sized files are in ISO format. why they choosen that format instead using any other formats like zip, rar, etc.
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1answer
14 views

Linux/windows boot lock

Is there any way to lock a Windows or Linux machine's boot. eg. You press the power button on a PC and it asks for a password before booting to the OS.
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0answers
51 views

How to write a program that works on different OS? [migrated]

The question I'm asking is a bit unclear, I think it's a bit hard to explain it with only one line. Here's my situation: I have a Bitbucket repertory which is cloned in both an Linux environment and ...
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0answers
30 views

How can I permanently change system limits in Mojave (OSX 10.14)?

How do you change the system limits for MacOS Mojave? I need to increase the open-file limit.
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0answers
19 views

No WiFi Pure OS Lenovo G50-80 [closed]

I installed Pure OS on my 80L0 Lenovo G50-80. apparently no WiFi drivers were installed. I’m brand new to Unix/Linux and programming. How do I activate or find and install the drivers for the WiFi ...
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1answer
27 views

Ubunut 18.04 failed to boot. [FAILED] Failed to start MySQL Community Server

I am facing serious issue. My hard disk was extremely full that 0 bytes available. I tried to empty the trash bin but it hanged. I restarted the system. But it failed. It gives this messages: [FAILED]...
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1answer
123 views

Removing near-duplicate rows in Filemon / Process Monitor to more easily analyze OS operations

Process Monitor allows great power when it comes to filtering, but it doesn't do something which seems extremely simple and beneficial, which is to simply allow the option to remove rows which are ...
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1answer
68 views

I have i3-7100 ,12gb ram , 3tb hdd and a 120gb ssd

Okay so I have i3-7100 ,12gb ram , 3tb hdd and a 120gb ssd I wanna migrate my os to my ssd ,but for some reason my os is 1.7Tb lol https://gyazo.com/e8181ef47abcc70db85292ada8bb3fb3 and my sdd is ...
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0answers
32 views

What's the best OS for removing rootkits? specifically firmware rootkits and windows registry rootkits. [duplicate]

I fjnally got financial to return to school after waitjng 3 years. 10 days before the last class of fall 1, i got hit with rootkits that took over my workstation/gaming PC and my laptop for school. ...
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1answer
53 views

System Image and Backup& Restore

I know there is threads talking about these 2 concepts, but I still have a few questions. So I have 3 physical drives (Drive C,D,E). My C drive contains my OS (Windows 10 already activated, so will be ...
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0answers
9 views

even after setting mac time manually (+30 min) , after restarting it retains original time

After setting the time setting of Mac, which runs OS 10.14, reinstate current actual time each and every time it restarts. I set the time of Mac +30 min past to current time for server and application ...
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1answer
35 views

Find all directories which has only one type of file

Given a file type .txt, find all directories that has only that type of file. For example a-- b-- 1.txt c-- | ---- 2.jpg ---- 3.txt The command should output only b not c....
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1answer
39 views

What is mouse pointer integration?

I'd like a high level description of what it is, and what operating systems need to do in order to support it in virtual machines.
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3answers
43 views

2 drives each with a different windows version

I just bought a new PC with windows 10 and upgraded graphics, mother board and other candy to game with. I like window 7 and have been using it for a few years and have many things I like better with ...
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1answer
50 views

How to access UEFI on Sony Vaio if “Operating System Not Found”

The hard disk in my old Sony Vaio laptop died and I'm trying to reinstall Windows 10 Pro on an SSD that I bought to replace the dead HDD. I found an official ISO download page, but the problem is the ...
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1answer
47 views

Ffmpeg on Mac OSx: cannot see Firewire cameras

I am trying to use ffmpeg on Mac Os x (High Sierra and Mojave: makes no difference) with a camcorder attached to a Firewire port (more precisely, I have a MacMini and the Firewire is attached to a ...
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1answer
45 views

OS on SSD other programs on HDD, performance?

I want to setup a new PC where in only the OS is installed on SSD. All other programs will be installed on the HDD. I'm doing this to reduce cost since bigger SSDs are more expensive. My question is, ...
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0answers
153 views

Mac OS VM in VirtualBox booting into uefi shell prompt

My Mac OS virtual machine is booting into Uefi prompt and I can't find the directory fs0. It only shows blk 0, blk2 etc. the boot.efi file is located in fs0. I have efi enabled. I tried with both ...
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0answers
32 views

Eumerate the process' memory pages which are executed by a program in Windows o.s

How can I enumerate a process' memory pages which are executed by a program in Windows? With "memory pages executed" I mean the (executable) memory pages with at least one instruction which was ...
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1answer
16 views

dtruss not working on my machine?

I am fairly new to Mac OSX. I need to examine some system calls, and apparently dtruss is a good tool for doing that. However, I think dtruss is not really working. When I execute sudo dtruss -a -f ...
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1answer
36 views

Make image of the OS

I am using a Nano Pi device which has Debian OS in it. The OS image is existing in its internal memory (8 GB). The total size of the used memory is somewhat 4GB. I want to take a backup of this OS ...
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1answer
26 views

Windows 7 professional installation

I am going to install new OS windows 7 professional sp1 and I going to bought from ebay US ,am an Indian is that key valid for Indian region or it araise any issue is bought from different country and ...
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1answer
75 views

Virtualization without a OS? [closed]

What is a program like VirtualBox, that can be installed Directly on Hardware, without using any OS?
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1answer
42 views

Is there an open source operating system I can run on an old Power Macintosh 9600? [closed]

I'd like to get some use out of an old Power Macintosh 9600 with a 350mhz PowerPC 604e and tinker with it. Is there any open source OS I can install on it?
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3answers
8k views

How is the operating system able to know the battery level?

Even if we remove the default OS and install a new one it can interact with the battery. Are there some drivers for it? How does it work?
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2answers
43 views

Are interrupts used to signify that output is ready or input has completed? [closed]

Operating System Concepts says: During I/O, the various device controllers raise interrupts when they are ready for service. These interrupts signify that output has completed, or ...
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1answer
171 views

GrubX64.efi not found error

Facing grubX64.efi not found with UEFI boot install. I am using rufus to convert it to usb and the strange part is, EFI folder(iso) has the following files: "BOOTIA32.EFI,BOOTX64.EFI,fonts,grub.cfg,...
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0answers
45 views

How to setup a Freedos with old Kernel version (2026a) to system

I bought a laptop with Freedos 1.1.26a build (2026a) and I formatted it to Windows 10. Now I want to get it back to Freedos with same version before. A solution on web was saying that formating where ...
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2answers
82 views

What is windows API?

I dug on the internet to try to have a clear idea of what are exactly a framework, a library, and an API. But I still don't understand something. What is the framework/library the windows API is ...
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1answer
42 views

Why do I have 4 partitions?

I wanted to install another OS on my laptop but I noticed that I already have 4 partitions the first is Healthy EFI Partition then Recovery then C: then Restore Partition. Should I remove one? If so ...
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0answers
54 views

HideWirelessSetupInOOBE not working. Wireless setup option still prompts after Task Deployment upon first logon attempt

After we deployed Windows 10 1803 via SCCM TS on computers with Wifi adapter automatically enabled, there is a step in the OOBE Setup Wizard to choose or skip the Wifi network, even if the ethernet ...
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0answers
20 views

Reinstalling Windows to Make MOBO and Memory LEDs Default

I’ve been trying to reset my motherboard and memory LEDs to default using MSI’s Mystic Light software, but every time I reboot, it loads to the same config, not the default settings I applied. Will ...
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0answers
14 views

Can't run any exe file after switching MS Account to Local Windows 10 account - “Run as Admin” works though [duplicate]

Its horrific, I cant even open regedit. When clicking on any .exe it asks me to choose an app to run it "You'll need a new app to open this .exe file" When trying to run "regedit" it promts that it ...
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1answer
26 views

Can I remove aeadisrv.exe from windows 7?

I have notice that aeadisrv.exe running on system background and it keep consuming about 22% of the cpu. Is it okay to remove it from my pc?
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0answers
34 views

Mac OS 10.13.6 1TB HDD - How can I reduce the System file size currently 438 GB

How can I reduce the System Storage file size Using the Manage Storage System, the File indicates 438.03 GB file size. How can I reduce this. I would also like to see inside the system folder to see ...
1
vote
1answer
209 views

Create Multi-OS INSTALLATION USB

I have big usb drive, say it 128GB, and want to download popular installation iso distributions, like Windows 7,10, Debian, Ubuntu, Gentoo, FreeBSD, so on. I need ability to install any OS to some ...
3
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2answers
53 views

Does an operating system give out any kind of signal before going into sleep mode?

In other words, does a running application have any way to know that the computer is going into sleep mode?
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0answers
41 views

Can i install Windows 10 dual boot Ubuntu correctly via Linux “install alongside” option?

I have Ubuntu 16.04 installed without important data. I want to have Ubuntu 16.04 dual boot Windows 10. I read that doing this dual boot is better from windows. I want to install Windows 10 with ...
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2answers
55 views

The “memory available” that an Operating System tells child processes

I'm wondering about how operating systems let child processes know how much available memory there is. Say the whole computer has 1GB RAM memory built in. The operating runs and uses 100MB (I have no ...
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3answers
96 views

How does OS know what physical ram is free?

How does the OS know/keep track of what part of physical ram is free, so it can map the virtual page address in the page table to a physical frame in ram on a page fault?
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1answer
249 views

Error loading operating system from USB

I am trying to load Windows 10 to a blank Dell hard drive, but this error keeps popping up: I have already updated the BIOS I have already ran a diagnostic and came out clean
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0answers
42 views

How to limit the launch of programs that do not have a digital signature?

the virtual machine Windows 12 r2. It is necessary to limit the launch of programs without a digital signature. Heard about SRP, tried to use, did not work, I do not understand what exactly is needed. ...
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1answer
53 views

Does operating system differ based on ISA or based on microarchitecture?

If an operating system is developed, say for instance 'Linux', will that be written slightly differently where needed (profiled) for different microarchitecture (Intel Pentium and AMD Athlon)? I see ...
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1answer
66 views

I deleted the whole HKEY_LOCAL_MACHINE\Software

I accidentally deleted the whole HKEY_LOCAL_MACHINE\Software, my computer is now unable to boot. I have tried system recovery, startup fix, previous good condition and safe mode is not working. How to ...
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0answers
25 views

Restarting Apache causes huge spike in system load

I'm using Apache as a reverse proxy to a Tornado application and currently load testing websockets on the system. Still in the prelim stages so the setup is as follows: I built a Node.js script ...
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0answers
127 views

How can I boot Windows 10 from my HDD located in caddy?

Intro: My laptop is DELL Inspiron 5720. I had a single slot for HDD in my laptop with Windows 10 installed on it. Then, I replaced my "old" HDD with a SSD. But instead of my ODD, I installed a caddy ...