{"id":461214,"date":"2022-06-11T16:00:04","date_gmt":"2022-06-11T13:00:04","guid":{"rendered":"https:\/\/en.buradabiliyorum.com\/what-is-cmos\/"},"modified":"2022-06-11T16:00:04","modified_gmt":"2022-06-11T13:00:04","slug":"what-is-cmos","status":"publish","type":"post","link":"https:\/\/buradabiliyorum.com\/en\/what-is-cmos\/","title":{"rendered":"#What Is CMOS?"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-6a41c2560da65\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #dd3333;color:#dd3333\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #dd3333;color:#dd3333\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-6a41c2560da65\" checked aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/buradabiliyorum.com\/en\/what-is-cmos\/#%E2%80%9CWhat_Is_CMOS%E2%80%9D\" >&#8220;What Is CMOS?&#8221;<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/buradabiliyorum.com\/en\/what-is-cmos\/#BIOS_Configuration_Storage\" >BIOS Configuration Storage<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/buradabiliyorum.com\/en\/what-is-cmos\/#How_Are_BIOS_and_CMOS_Related\" >How Are BIOS and CMOS Related?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/buradabiliyorum.com\/en\/what-is-cmos\/#What_Is_a_CMOS_Battery\" >What Is a CMOS Battery?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/buradabiliyorum.com\/en\/what-is-cmos\/#How_to_Clear_CMOS\" >How to Clear CMOS<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/buradabiliyorum.com\/en\/what-is-cmos\/#Small_but_Important_Part\" >Small but Important Part<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h1><span class=\"ez-toc-section\" id=\"%E2%80%9CWhat_Is_CMOS%E2%80%9D\"><\/span>&#8220;What Is CMOS?&#8221;<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<div>\n<!-- UNCACHED CONTENT --><\/p>\n<figure style=\"width: 1200px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"type:primaryImage wp-image-806748 size-full\" data-pagespeed-no-defer=\"\" src=\"https:\/\/www.howtogeek.com\/wp-content\/uploads\/2022\/05\/cmos-battery-backup.jpg?width=1198&amp;trim=1,1&amp;bg-color=000&amp;pad=1,1\" alt=\"A CMOS battery backup for BIOS on a motherboard.\" width=\"1200\" height=\"675\" data-crediturl=\"https:\/\/www.shutterstock.com\/image-photo\/cmos-backup-battery-powering-bios-settings-1899299680\" data-credittext=\"Maryia_K\/Shutterstock.com\"\/><figcaption class=\"wp-caption-text\"><span class=\"type:primaryImage imagecredit\"><a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/www.shutterstock.com\/image-photo\/cmos-backup-battery-powering-bios-settings-1899299680\">Maryia_K\/Shutterstock.com<\/a><\/span><\/figcaption><\/figure>\n<p>If you are having boot or display issues on your computer, you are likely to come across recommendations about clearing the CMOS. But what does CMOS do, and how is it related to BIOS? Here\u2019s everything you need to know.<\/p>\n<h2 role=\"heading\" aria-level=\"2\"><span class=\"ez-toc-section\" id=\"BIOS_Configuration_Storage\"><\/span>BIOS Configuration Storage<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The term CMOS, pronounced as \u201csea-moss,\u201d is commonly used to describe a small memory on a computer motherboard that stores BIOS or UEFI settings, including system date, time, and hardware configuration.<\/p>\n<p>CMOS is short for Complementary Metal-Oxide-Semiconductor, which is a type of fabrication process used in the construction of various integrated circuit (IC) chips, including the memory chip being used to store the BIOS settings.<\/p>\n<p>It is also referred to as CMOS RAM, BIOS RAM, and non-volatile BIOS memory. While CMOS is most commonly associated with Windows computers, Macs have a similar memory, and it\u2019s called NVRAM or PRAM.<\/p>\n<h2 role=\"heading\" aria-level=\"2\"><span class=\"ez-toc-section\" id=\"How_Are_BIOS_and_CMOS_Related\"><\/span>How Are BIOS and CMOS Related?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<figure style=\"width: 650px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-748266 size-full\" data-pagespeed-lazy-src=\"https:\/\/www.howtogeek.com\/wp-content\/uploads\/2016\/09\/computer-chip-on-a-motherboard.jpeg?trim=1,1&amp;bg-color=000&amp;pad=1,1\" alt=\"A computer chip on a motherboard\" width=\"650\" height=\"300\" data-crediturl=\"https:\/\/www.shutterstock.com\/image-photo\/chip-on-motherboard-mainboard-controllers-ports-274425767\" data-credittext=\"Vedmed85\/Shutterstock.com\" src=\"\/pagespeed_static\/1.JiBnMqyl6S.gif\" onload=\"pagespeed.lazyLoadImages.loadIfVisibleAndMaybeBeacon(this);\" onerror=\"this.onerror=null;pagespeed.lazyLoadImages.loadIfVisibleAndMaybeBeacon(this);\"\/><figcaption class=\"wp-caption-text\"><span class=\"imagecredit\"><a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/www.shutterstock.com\/image-photo\/chip-on-motherboard-mainboard-controllers-ports-274425767\">Vedmed85\/Shutterstock.com<\/a><\/span><\/figcaption><\/figure>\n<p>To understand the relation between BIOS and CMOS, it helps to know the role of a BIOS in your computer. BIOS, short for Basic Input-Output System, is a firmware that comes with your computer\u2019s motherboard. It\u2019s responsible for initializing your computer\u2019s hardware, testing it, and booting up the operating system when you hit the power button.<\/p>\n<p>However, as BIOS is stored in read-only memory, it can\u2019t save any changes you make to its configuration, such as tweaks to the boot order or overclock settings. These changes, along with the system date and time, are saved in CMOS. So CMOS can be essential to your computer\u2019s stable functioning. And if your CMOS is cleared or its battery fails, you lose all your BIOS tweaks, and it reverts to the default settings.<\/p>\n<h2 role=\"heading\" aria-level=\"2\"><span class=\"ez-toc-section\" id=\"What_Is_a_CMOS_Battery\"><\/span>What Is a CMOS Battery?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<figure style=\"width: 650px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-806776\" data-pagespeed-lazy-src=\"https:\/\/www.howtogeek.com\/wp-content\/uploads\/2022\/05\/cmos-battery.jpg?trim=1,1&amp;bg-color=000&amp;pad=1,1\" alt=\"Person installing a lithium CR2025 battery as a backup on a motherboard.\" width=\"650\" height=\"433\" src=\"\/pagespeed_static\/1.JiBnMqyl6S.gif\" onload=\"pagespeed.lazyLoadImages.loadIfVisibleAndMaybeBeacon(this);\" onerror=\"this.onerror=null;pagespeed.lazyLoadImages.loadIfVisibleAndMaybeBeacon(this);\"\/><figcaption class=\"wp-caption-text\"><span class=\"imagecredit\"><a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/www.shutterstock.com\/image-photo\/computer-mechanic-install-lithium-battery-cr2025-2018099216\">BLKstudio\/Shutterstock.com<\/a><\/span><\/figcaption><\/figure>\n<p>The CMOS battery is usually a <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/www.lifesavvy.com\/reviews\/the-best-cr-2032-batteries-for-your-devices\/\">CR2032 lithium coin battery<\/a> on your computer\u2019s motherboard. It was traditionally used to power the CMOS as older motherboards used a volatile memory to store the BIOS settings. Volatile memory loses data when it loses power. So a battery was used to provide power to the memory even after you had shut down the computer or removed the power cord.<\/p>\n<p>However, the modern UEFI motherboards use a non-volatile memory or NVRAM to store UEFI configuration data. The non-volatile memory can retain data even without <a href=\"https:\/\/buradabiliyorum.com\/en\/category\/download-scripts-themes-apps\/\" data-internallinksmanager029f6b8e52c=\"9\" title=\"Download Scripts &amp; Themes &amp; Apps\" target=\"_blank\" rel=\"noopener\">app<\/a>lied power. That said, CMOS batteries are still used to keep time in your computer. And since the removal or failure of CMOS battery has traditionally been associated with clearing CMOS data, modern motherboards also reset UEFI settings when CMOS battery fails.<\/p>\n<p>Most CMOS batteries last anywhere between two to 10 years, depending on the computer usage. But if your computer is showing the wrong system time or date after a reboot or you are facing hardware compatibility issues, it may be time to replace the CMOS battery. Other key symptoms of a failed CMOS battery include problems in the boot process and constant beeping noise from the motherboard. You may also get errors, such as \u201cCMOS Read Error,\u201d \u201cCMOS Battery Failure,\u201d and \u201cCMOS Checksum Error.\u201d<\/p>\n<h2 role=\"heading\" aria-level=\"2\"><span class=\"ez-toc-section\" id=\"How_to_Clear_CMOS\"><\/span>How to Clear CMOS<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>There are occasions when you may have to clear your computer\u2019s CMOS to reset BIOS or UEFI settings. However, it\u2019s a relatively straightforward process, and depending on whether or not you have access to BIOS or UEFI menu, there are a few ways to achieve this.<\/p>\n<p>One of the easiest ways to clear CMOS is by going to the BIOS or UEFI settings and choosing the reset option. It\u2019s typically called \u201cLoad factory defaults\u201d or \u201cLoad setup defaults.\u201d You can also use the CMOS clear button if available on your motherboard. This button can either be found on the IO plate or near the CMOS battery.<\/p>\n<figure style=\"width: 650px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-804413 size-full\" data-pagespeed-lazy-src=\"https:\/\/www.howtogeek.com\/wp-content\/uploads\/2012\/12\/shutterstock_2060181224.png?trim=1,1&amp;bg-color=000&amp;pad=1,1\" alt=\"Clear CMOS button.\" width=\"650\" height=\"500\" data-crediturl=\"https:\/\/www.shutterstock.com\/image-photo\/woodville-australia-october-15-2021-close-2060181224\" data-credittext=\"myphotobank.com.au\/Shutterstock.com\" src=\"\/pagespeed_static\/1.JiBnMqyl6S.gif\" onload=\"pagespeed.lazyLoadImages.loadIfVisibleAndMaybeBeacon(this);\" onerror=\"this.onerror=null;pagespeed.lazyLoadImages.loadIfVisibleAndMaybeBeacon(this);\"\/><figcaption class=\"wp-caption-text\"><span class=\"imagecredit\"><a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/www.shutterstock.com\/image-photo\/woodville-australia-october-15-2021-close-2060181224\">myphotobank.com.au\/Shutterstock.com<\/a><\/span><\/figcaption><\/figure>\n<p>In addition, reseating the CMOS battery is another way to clear the CMOS data. But you will need to open your computer and access the motherboard to reseat or replace the battery. But don\u2019t worry. You can find detailed instructions and more ways to clear your computer CMOS in our detailed guide.<\/p>\n<h2 role=\"heading\" aria-level=\"2\"><span class=\"ez-toc-section\" id=\"Small_but_Important_Part\"><\/span>Small but Important Part<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>CMOS is a nifty little component that most computer users never have to worry about. Also, there is no benefit in tinkering with it unless you are troubleshooting your computer and need to revert BIOS or UEFI to its default settings. So you can forget about CMOS until you need it.<\/p>\n<\/div>\n<p><script>\n setTimeout(function(){\n  !function(f,b,e,v,n,t,s)\n  {if(f.fbq)return;n=f.fbq=function(){n.callMethod?\n  n.callMethod.apply(n,arguments):n.queue.push(arguments)};\n  if(!f._fbq)f._fbq=n;n.push=n;n.loaded=!0;n.version='2.0';\n  n.queue=[];t=b.createElement(e);t.async=!0;\n  t.src=v;s=b.getElementsByTagName(e)[0];\n  s.parentNode.insertBefore(t,s) } (window, document,'script',\n  'https:\/\/connect.facebook.net\/en_US\/fbevents.js');\n   fbq('init', '335401813750447');\n   fbq('track', 'PageView');\n  },3000);\n<\/script><\/p>\n<blockquote><p><strong><span style=\"color: #ff6600;\">If you liked the article, do not forget to share it with your friends. Follow us on\u00a0<span style=\"color: #ff0000;\"><a style=\"color: #ff0000;\" href=\"https:\/\/news.google.com\/publications\/CAAqBwgKMLG0nwswvr63Aw\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">Google News<\/a><\/span>\u00a0too, click on the star and choose us from your favorites.<\/span><\/strong><\/p><\/blockquote>\n<blockquote>\n<p style=\"text-align: center;\">For forums sites go to <span style=\"color: #ff9900;\"><a style=\"color: #ff9900;\" href=\"https:\/\/forum.buradabiliyorum.com\/\" target=\"_blank\" rel=\"noopener\">Forum.BuradaBiliyorum.Com<\/a><\/span><\/strong><\/p>\n<\/blockquote>\n<blockquote>\n<p style=\"text-align: center;\"><strong>If you want to read more like this article, you can visit our <span style=\"color: #ff9900;\"><a style=\"color: #ff9900;\" href=\"https:\/\/en.buradabiliyorum.com\/technology\/\" target=\"_blank\" rel=\"noopener\">Technology category.<\/a><\/span><\/strong><\/p>\n<\/blockquote>\n<p><span style=\"color: black;\"><a style=\"color: #ff9900;\" href=\"https:\/\/www.howtogeek.com\/805136\/what-is-cmos\/\" target=\"_blank\" rel=\"noopener\">Source<\/a><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>&#8220;What Is CMOS?&#8221; Maryia_K\/Shutterstock.com If you are having boot or display issues on your computer, you are likely to come across recommendations about clearing the CMOS. But what does CMOS do, and how is it related to BIOS? Here\u2019s everything you need to know. BIOS Configuration Storage The term CMOS, pronounced as \u201csea-moss,\u201d is commonly&#8230;<\/p>\n","protected":false},"author":1,"featured_media":461215,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"https:\/\/www.howtogeek.com\/wp-content\/uploads\/2022\/05\/cmos-battery-backup.jpg?height=200p&trim=2,2,2,2","fifu_image_alt":"","footnotes":""},"categories":[18],"tags":[],"class_list":["post-461214","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technology"],"_links":{"self":[{"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/posts\/461214","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/comments?post=461214"}],"version-history":[{"count":0,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/posts\/461214\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/media\/461215"}],"wp:attachment":[{"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/media?parent=461214"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/categories?post=461214"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/tags?post=461214"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}