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DOS

(1) See denial of service. (2) (Disk Operating System) Any operating system that supports hard drives. See operating system. (3) (Disk Operating System) A family of IBM mainframe operating...

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Definition: DOS

(1) See denial of service.

(2) (Disk Operating System) Any operating system that supports hard drives. See operating system.

(3) (Disk Operating System) A family of IBM mainframe operating systems (DOS, DOS/370, DOS/VS, DOS/VSE). As disk storage became accepted in the late 1960s, DOS started out as a variant of IBM's Tape Operating System (TOS); however, it was always the "junior partner" to OS/360 and its progeny. See DOS/VSE.

(4) (Disk Operating System) Pronounced "dahss." A single-user operating system from Microsoft for Intel x86 personal computers. It was the first operating system for IBM PCs and IBM-compatible PCs, and it remained the underlying control program for Windows 3.1, 95, 98 and ME. Subsequent versions of Windows incorporated all DOS functionality, and most DOS commands work the same in Windows. See cmd abc's.

PC-DOS and MS-DOS
The OS in the IBM PC was PC-DOS, and the OS used by all other PC makers was MS-DOS. Except for DOS 6, which contained different utilities, PC-DOS and MS-DOS commands and system functions were the same, and all PC-DOS and MS-DOS versions were commonly called "DOS." See DOS 6.

DOS Lives On
In various incarnations, DOS is still used in embedded systems, where a small OS footprint is required. Examples are Digital Research's DR-DOS, ROM-DOS from DataLight (www.datalight.com) and the open source FreeDOS. See embedded system.



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  • Happy Birthday, MS-DOS - 30 years old this week

    It might be dead and gone and forgotten, but this week sees Microsoft's DOS (Disk Operating System) turning 30 years old.

    Blog posts | August 1, 2011 7:50am PDT

  • Apple approves DOS emulator for App Store, then changes its mind

    For a short period of time a DOS emulator made its way into Apple's App Store. But don't all rush to the App Store looking for it, because Apple quickly had a change of heart and pulled iDOS from...

    Blog posts | October 27, 2010 9:00am PDT

  • DOS, Windows app runs on an iPad, iPhone

    Somehow, Apple has approved a DOS emulator for the iPhone and iPad and it's on the App Store for 99 cents.

    News items | October 26, 2010 1:57pm PDT

  • DOS boot still frustrates laptop Linux

    Systems like Ubuntu will remain education and hobbyist environments. Until you can deliver the applications people need and use (a changing landscape) without leaving the GUI, users who buy your...

    Blog posts | April 15, 2010 6:32am PDT

  • Google patches Android DoS vulnerabilities

    Google has shipped a new version of the Android open-source mobile phone platform to fix a pair of security flaws that could lead to denial-of-service attacks.

    Blog posts | October 9, 2009 11:17am PDT

  • Report: Cisco wireless LAN at risk from 'skyjack' attack

    Cisco Systems wireless local area network equipment used by many corporations around the world is at risk of being used in denial-of-service attacks and data theft, according to a report.

    News items | August 25, 2009 5:37am PDT

  • Twitter knocked offline by DDoS attack; Koobface returns with a twist

    Popular microblogging service Twitter was knocked offline for an extended period this morning by what appears to be a massive distributed denial-of-service attacks. Twitter confirmed the outage...

    Blog posts | August 6, 2009 9:46am PDT

  • Dos and Don'ts When Pitching the Media

    How do you get editors and bloggers to listen to your story? Find out as I present the nine tips PR professionals should keep in mind when they pitch the media. These are ideas presented in a...

    Image galleries | May 5, 2009 7:07am PDT

  • Google triggers annoying DoS CAPTCHA prompt?

    Twice today during work -- from the confines of Google Chrome, no less -- I've been prompted, while logged into Google, with a denial-of-service notice stating the following: We're sorry, but your...

    Blog posts | February 23, 2009 10:18am PST

  • Two Europeans indicted for US cyberattacks

    The indictments are part of the FBI's Operation Cyberslam, said to be the US's first successful investigation into a large-scale, commercially motivated denial-of-service attack

    News items | October 6, 2008 5:50am PDT

  • NATO allies form shield against cyber attacks

    NATO is creating a cyber-command to protect its allies against crippling online attacks on national infrastructure.

    News items | April 8, 2008 11:28am PDT

  • Remote execution DoS exploits iPhone by simply loading a Web page

    A new iPhone Safari remote execution DoS exploit will crash your iPhone by simply visiting a malicious page. David from iPhoneWorld claims that the exploit will crash iPhone's Safari browser and...

    Blog posts | March 18, 2008 5:09am PDT

  • Skype still down - Published DoS exploit may be culprit

    [UPDATE 8/18/2007 - Another Russian site is claiming this was a DoS attack against Skype's authentication servers.  Skype continue to deny.]  It's been a day and Skype is still down for me. ...

    Blog posts | August 17, 2007 12:54am PDT

  • Cisco posts workaround for Communications Manager DoS vulnerability

    Cisco says it has now posted a workaround for a security vulnerability in Cisco Unified Communications Manager. The vulnerability could allow a remote, unauthenticated user to cause a denial of...

    Blog posts | July 16, 2007 11:19am PDT

  • How to REALLY erase a hard drive - Update

    A new version of HDerase.exe has been released Go direct to UCSD's Center for Magnetic Recording Research website to download version 3.2. HDerase.exe accesses an ATA disk drive's internal Secure...

    Blog posts | June 15, 2007 11:11am PDT

  • Linux kernel flaw could trigger DoS incidents

    Several versions of Linux from multiple vendors are reportedly vulnerable to a flaw in the Linux 2.4 kernel. According to the initial report from Secunia, the threat is related to a problem in the...

    News items | May 27, 2003 12:00am PDT

  • Where old software goes to die

    Older applications made fade from the spotlight, but that doesn't mean they're gone. Larry Seltzer looks at what happens to popular software that's past its prime.

    News items | January 15, 2003 12:00am PST

  • Standardizing on Windows enables intranet apps

    Upgrading a fleet of DOS-based desktops to Windows became the order of the day when Burger King franchisee AmeriKing decided to build an intranet portal.

    News items | February 19, 2002 12:00am PST

  • Winternals: Norton Utilities for experts

    They're not cheap or easy, and they're definitely not perfect, but for Windows system administrators, Larry Seltzer thinks Winternals tools can be lifesavers.

    News items | January 2, 2002 12:00am PST

  • Documentation is good, but source code is better

    An order for full documentation of all APIs was a part of the judgment against Microsoft, but its source code would be much more informative.

    News items | October 10, 2001 12:00am PDT

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