1"use strict";(self.webpackChunkyolo=self.webpackChunkyolo||[]).push([["1724"],{48675(s,e,i){i.r(e),i.d(e,{metadata:()=>d,default:()=>j,frontMatter:()=>l,contentTitle:()=>h,toc:()=>p,assets:()=>o});var d=JSON.parse('{"id":"notes/tips/digital-electronics/sd-card-specifications","title":"SD Card Specifications","description":"SD card specifications, include formats, capacity standards, bus marks, speed classes, Application Performance Classes.","source":"@site/docs/notes/tips/digital-electronics/sd-card-specifications.mdx","sourceDirName":"notes/tips/digital-electronics","slug":"/notes/tips/digital-electronics/sd-card-specifications","permalink":"/docs/notes/tips/digital-electronics/sd-card-specifications","draft":false,"unlisted":false,"tags":[{"inline":false,"label":"\u5907\u5FD8\u6E05\u5355","permalink":"/docs/tags/cheat-sheet"}],"version":"current","lastUpdatedAt":1779200549000,"frontMatter":{"image":"https://media.kingston.com/kingston/hero/ktc-hero-blog-personal-storage-guide-speed-classes-sd-microsd-cards-960.jpg","description":"SD card specifications, include formats, capacity standards, bus marks, speed classes, Application Performance Classes.","tags":["cheat-sheet"]},"sidebar":"docsSidebar","previous":{"title":"\u5FC5\u5907\u8F6F\u4EF6","permalink":"/docs/notes/tips/digital-electronics/must-have-software"},"next":{"title":"Video Codecs","permalink":"/docs/notes/tips/digital-electronics/video-codecs"}}'),r=i(74848),n=i(28453),t=i(34164),a=i(96540);function c({className:s,...e}){let[i,d]=(0,a.useState)(!1);return(0,r.jsx)("img",{className:(0,t.A)(s,i?"dark-invert":null),onLoad:()=>{d(!0)},onError:()=>{d(!1)},...e,decoding:"async",loading:"lazy",referrerPolicy:"no-referrer"})}let l={image:"https://media.kingston.com/kingston/hero/ktc-hero-blog-personal-storage-guide-speed-classes-sd-microsd-cards-960.jpg",description:"SD card specifications, include formats, capacity standards, bus marks, speed classes, Application Performance Classes.",tags:["cheat-sheet"]},h="SD Card Specifications",o={},p=[{value:"Formats",id:"formats",level:2},{value:"Capacity Standards",id:"capacity-standards",level:2},{value:"Bus Marks",id:"bus-marks",level:2},{value:"Speed Classes",id:"speed-classes",level:2},{value:"Application Performance Classes",id:"application-performance-classes",level:2},{value:"References",id:"references",level:2}];function x(s){let e={a:"a",code:"code",h1:"h1",h2:"h2",header:"header",li:"li",p:"p",strong:"strong",table:"table",tbody:"tbody",td:"td",th:"th",thead:"thead",tr:"tr",ul:"ul",...(0,n.R)(),...s.components};return(0,r.jsxs)(r.Fragment,{children:[(0,r.jsx)(e.header,{children:(0,r.jsx)(e.h1,{id:"sd-card-specifications",children:"SD Card Specifications"})}),"\n",(0,r.jsxs)(e.p,{children:["The SD card is a flash memory card format developed by the ",(0,r.jsx)(e.a,{href:"https://www.sdcard.org/",children:"SD Association"})," (SDA), which was introduced in August 1999 as ",(0,r.jsx)(e.strong,{children:"Secure Digital"})," by ",(0,r.jsx)(e.a,{href:"https://www.sandisk.com/",children:"SanDisk"}),", ",(0,r.jsx)(e.a,{href:"https://panasonic.com/",children:"Panasonic"})," (then known as Matsushita), and ",(0,r.jsx)(e.a,{href:"https://www.kioxia.com/",children:"Kioxia"})," (then part of ",(0,r.jsx)(e.a,{href:"https://www.global.toshiba/ww/top.html",children:"Toshiba"}),")."]}),"\n",(0,r.jsx)(e.h2,{id:"formats",children:"Formats"}),"\n",(0,r.jsxs)(e.table,{children:[(0,r.jsx)(e.thead,{children:(0,r.jsxs)(e.tr,{children:[(0,r.jsx)(e.th,{children:"Format"}),(0,r.jsx)(e.th,{children:"When introduced"}),(0,r.jsx)(e.th,{children:"Note"})]})}),(0,r.jsxs)(e.tbody,{children:[(0,r.jsxs)(e.tr,{children:[(0,r.jsx)(e.td,{children:"SD"}),(0,r.jsx)(e.td,{children:"August 1999"}),(0,r.jsxs)(e.td,{children:[(0,r.jsx)(e.code,{children:"SD"})," meaning ",(0,r.jsx)(e.strong,{children:"Secure Digital"})]})]}),(0,r.jsxs)(e.tr,{children:[(0,r.jsx)(e.td,{children:"miniSD"}),(0,r.jsx)(e.td,{children:"March 2003"}),(0,r.jsxs)(e.td,{children:["phased out by 2008 following the introduction of ",(0,r.jsx)(e.code,{children:"microSD"})]})]}),(0,r.jsxs)(e.tr,{children:[(0,r.jsx)(e.td,{children:"microSD"}),(0,r.jsx)(e.td,{children:"March 2004"}),(0,r.jsxs)(e.td,{children:["initially under the name ",(0,r.jsx)(e.code,{children:"T-Flash"}),", later rebranded as ",(0,r.jsx)(e.code,{children:"TransFlash"})," or ",(0,r.jsx)(e.code,{children:"TF"})]})]})]})]}),"\n",(0,r.jsx)(e.h2,{id:"capacity-standards",children:"Capacity Standards"}),"\n","\n",(0,r.jsxs)("table",{children:[(0,r.jsx)("thead",{children:(0,r.jsxs)("tr",{children:[(0,r.jsx)("th",{}),(0,r.jsx)("th",{children:"SDSC"}),(0,r.jsx)("th",{children:"SDHC"}),(0,r.jsx)("th",{children:"SDXC"}),(0,r.jsx)("th",{children:"SDUC"})]})}),(0,r.jsxs)("tbody",{children:[(0,r.jsxs)("tr",{children:[(0,r.jsx)("th",{children:"Full name"}),(0,r.jsx)("td",{children:"SD Standard Capacity"}),(0,r.jsx)("td",{children:"SD High Capacity"}),(0,r.jsx)("td",{children:"SD eXtended Capacity"}),(0,r.jsx)("td",{children:"SD Ultra Capacity"})]}),(0,r.jsxs)("tr",{children:[(0,r.jsx)("th",{children:"Mark"}),(0,r.jsx)("td",{children:(0,r.jsx)(c,{src:"https://upload.wikimedia.org/wikipedia/commons/thumb/c/cd/SD-Logo.svg/60px-SD-Logo.svg.png",alt:"SDSC"})}),(0,r.jsx)("td",{children:(0,r.jsx)(c,{src:"https://upload.wikimedia.org/wikipedia/commons/thumb/2/26/SDHC-Logo.svg/60px-SDHC-Logo.svg.png",alt:"SDHC"})}),(0,r.jsx)("td",{children:(0,r.jsx)(c,{src:"https://upload.wikimedia.org/wikipedia/commons/thumb/9/92/SDXC.svg/60px-SDXC.svg.png",alt:"SDXC"})}),(0,r.jsx)("td",{children:(0,r.jsx)(c,{src:"https://upload.wikimedia.org/wikipedia/en/thumb/b/bf/SDUC.svg/60px-SDUC.svg.png",alt:"SDUC"})})]}),(0,r.jsxs)("tr",{children:[(0,r.jsx)("th",{children:"Max capacity"}),(0,r.jsx)("td",{children:"2 GB"}),(0,r.jsx)("td",{children:"32 GB"}),(0,r.jsx)("td",{children:"2 TB"}),(0,r.jsx)("td",{children:"128 TB"})]}),(0,r.jsxs)("tr",{children:[(0,r.jsx)("th",{children:"File system"}),(0,r.jsx)("td",{children:"FAT12, FAT16"}),(0,r.jsx)("td",{children:"FAT32"}),(0,r.jsx)("td",{colSpan:"2",children:"exFAT"})]}),(0,r.jsxs)("tr",{children:[(0,r.jsx)("th",{children:"When introduced"}),(0,r.jsx)("td",{children:"August 1999"}),(0,r.jsx)("td",{children:"January 2006"}),(0,r.jsx)("td",{children:"January 2009"}),(0,r.jsx)("td",{children:"June 2018"})]})]})]}
1),"\n",(0,r.jsx)(e.h2,{id:"bus-marks",children:"Bus Marks"}),"\n",(0,r.jsxs)(e.p,{children:["Bus marks indicate the ",(0,r.jsx)(e.strong,{children:"maximum"})," interface speed and data transfer protocol."]}),"\n",(0,r.jsxs)("table",{children:[(0,r.jsx)("thead",{children:(0,r.jsxs)("tr",{children:[(0,r.jsx)("th",{children:"Interface"}),(0,r.jsx)("th",{children:"Mark"}),(0,r.jsx)("th",{children:"Bus speed (MB/s)"})]})}),(0,r.jsxs)("tbody",{children:[(0,r.jsxs)("tr",{children:[(0,r.jsx)("td",{children:"Default"}),(0,r.jsx)("td",{rowSpan:"2"}),(0,r.jsx)("td",{children:"12.5"})]}),(0,r.jsxs)("tr",{children:[(0,r.jsx)("td",{children:"High Speed"}),(0,r.jsx)("td",{children:"25"})]}),(0,r.jsxs)("tr",{children:[(0,r.jsx)("td",{rowSpan:"2",children:"UHS-I"}),(0,r.jsx)("td",{rowSpan:"2",children:(0,r.jsx)(c,{src:"https://upload.wikimedia.org/wikipedia/commons/thumb/7/73/UHS-I.svg/20px-UHS-I.svg.png",alt:"UHS-I"})}),(0,r.jsx)("td",{children:"50"})]}),(0,r.jsx)("tr",{children:(0,r.jsx)("td",{children:"104"})}),(0,r.jsxs)("tr",{children:[(0,r.jsx)("td",{rowSpan:"2",children:"UHS-II"}),(0,r.jsx)("td",{rowSpan:"2",children:(0,r.jsx)(c,{src:"https://upload.wikimedia.org/wikipedia/commons/thumb/8/83/UHS-II.svg/40px-UHS-II.svg.png",alt:"UHS-II"})}),(0,r.jsx)("td",{children:"156"})]}),(0,r.jsx)("tr",{children:(0,r.jsx)("td",{children:"312"})}),(0,r.jsxs)("tr",{children:[(0,r.jsx)("td",{rowSpan:"2",children:"UHS-III"}),(0,r.jsx)("td",{rowSpan:"2",children:(0,r.jsx)(c,{src:"https://upload.wikimedia.org/wikipedia/commons/thumb/5/55/UHS-III.svg/40px-UHS-III.svg.png",alt:"UHS-III"})}),(0,r.jsx)("td",{children:"312"})]}),(0,r.jsx)("tr",{children:(0,r.jsx)("td",{children:"624"})}),(0,r.jsxs)("tr",{children:[(0,r.jsx)("td",{rowSpan:"3",children:"SD Express"}),(0,r.jsx)("td",{rowSpan:"3",children:(0,r.jsx)(c,{src:"https://upload.wikimedia.org/wikipedia/commons/thumb/5/58/SDex%28short%29.svg/40px-SDex%28short%29.svg.png",alt:"SD Express"})}),(0,r.jsx)("td",{children:"985"})]}),(0,r.jsx)("tr",{children:(0,r.jsx)("td",{children:"1969"})}),(0,r.jsx)("tr",{children:(0,r.jsx)("td",{children:"3938"})})]})]}),"\n",(0,r.jsx)(e.h2,{id:"speed-classes",children:"Speed Classes"}),"\n",(0,r.jsxs)(e.p,{children:["Speed classes guarantee the ",(0,r.jsx)(e.strong,{children:"minimum"})," sustained ",(0,r.jsx)(e.strong,{children:"write"})," speed required for steady tasks like video recording."]}),"\n",(0,r.jsx)(e.p,{children:"The SDA created four types of speed classifications:"}),"\n",(0,r.jsxs)(e.ul,{children:["\n",(0,r.jsx)(e.li,{children:'Original Speed Class \u2013 represented by a number encircled with a "C"'}),"\n",(0,r.jsx)(e.li,{children:'Ultra-High Speed (UHS) Class \u2013 represented by a number inside a "U"; designed for high-bandwidth tasks such as 4K video recording'}),"\n",(0,r.jsx)(e.li,{children:'Video Speed Class \u2013 represented by a stylized "V" followed by the number; introduced to support high-resolution formats such as 4K and 8K'}),"\n",(0,r.jsx)(e.li,{children:'SD Express Speed Class \u2013 represented by a stylized "E" followed by the number, enclosed in a rounded rectangle; designed for data-intensive applications such as large-scale video processing, real-time analytics, and software execution'}),"\n"]}),"\n",(0,r.jsxs)("table",{children:[(0,r.jsxs)("thead",{children:[(0,r.jsxs)("tr",{children:[(0,r.jsx)("th",{rowSpan:"2",children:"Min
1speed (MB/s)"}),(0,r.jsx)("th",{colSpan:"4",children:"Speed class"}),(0,r.jsx)("th",{colSpan:"4",children:"Video format"})]}),(0,r.jsxs)("tr",{children:[(0,r.jsx)("th",{children:"Original"}),(0,r.jsx)("th",{children:"UHS"}),(0,r.jsx)("th",{children:"Video"}),(0,r.jsx)("th",{children:"SD Express"}),(0,r.jsx)("th",{children:"SD"}),(0,r.jsx)("th",{children:"HD"}),(0,r.jsx)("th",{children:"4K"}),(0,r.jsx)("th",{children:"8K"})]})]}),(0,r.jsxs)("tbody",{children:[(0,r.jsxs)("tr",{children:[(0,r.jsx)("td",{children:"2"}),(0,r.jsx)("td",{children:(0,r.jsx)(c,{src:"https://upload.wikimedia.org/wikipedia/commons/thumb/8/89/SDHC_Speed_Class_2.svg/40px-SDHC_Speed_Class_2.svg.png",alt:"C2"})}),(0,r.jsx)("td",{rowSpan:"3"}),(0,r.jsx)("td",{rowSpan:"2"}),(0,r.jsx)("td",{rowSpan:"7"}),(0,r.jsx)("td",{rowSpan:"11",style:{backgroundColor:"var(--ifm-color-success)"},children:(0,r.jsx)(e.p,{children:"Yes"})}),(0,r.jsx)("td",{style:{backgroundColor:"var(--ifm-color-danger)"},children:"No"}),(0,r.jsx)("td",{rowSpan:"2",style:{backgroundColor:"var(--ifm-color-danger)"},children:(0,r.jsx)(e.p,{children:"No"})}),(0,r.jsx)("td",{rowSpan:"4",style:{backgroundColor:"var(--ifm-color-danger)"},children:(0,r.jsx)(e.p,{children:"No"})})]}),(0,r.jsxs)("tr",{children:[(0,r.jsx)("td",{children:"4"}),(0,r.jsx)("td",{children:(0,r.jsx)(c,{src:"https://upload.wikimedia.org/wikipedia/commons/thumb/e/ec/SDHC_Speed_Class_4.svg/40px-SDHC_Speed_Class_4.svg.png",alt:"C4"})}),(0,r.jsx)("td",{rowSpan:"10",style:{backgroundColor:"var(--ifm-color-success)"},children:(0,r.jsx)(e.p,{children:"Yes"})})]}),(0,r.jsxs)("tr",{children:[(0,r.jsx)("td",{children:"6"}),(0,r.jsx)("td",{children:(0,r.jsx)(c,{src:"https://upload.wikimedia.org/wikipedia/commons/thumb/1/19/SDHC_Speed_Class_6.svg/40px-SDHC_Speed_Class_6.svg.png",alt:"C6"})}),(0,r.jsx)("td",{children:(0,r.jsx)(c,{src:"https://upload.wikimedia.org/wikipedia/en/thumb/a/a2/SD_Video_Speed_Class_6.svg/60px-SD_Video_Speed_Class_6.svg.png",alt:"V6",height:"30"})}),(0,r.jsx)("td",{rowSpan:"9",style:{backgroundColor:"var(--ifm-color-success)"},children:(0,r.jsx)(e.p,{children:"Yes"})})]}),(0,r.jsxs)("tr",{children:[(0,r.jsx)("td",{children:"10"}),(0,r.jsx)("td",{children:(0,r.jsx)(c,{src:"https://upload.wikimedia.org/wikipedia/commons/thumb/e/e0/SDHC_Speed_Class_10.svg/40px-SDHC_Speed_Class_10.svg.png",alt:"C10"})}),(0,r.jsx)("td",{children:(0,r.jsx)(c,{src:"https://upload.wikimedia.org/wikipedia/en/thumb/c/c3/SD_UHS_Speed_Class_1.svg/40px-SD_UHS_Speed_Class_1.svg.png",alt:"U1"})}),(0,r.jsx)("td",{children:(0,r.jsx)(c,{src:"https://upload.wikimedia.org/wikipedia/en/thumb/a/aa/SD_Video_Speed_Class_10.svg/60px-SD_Video_Speed_Class_10.svg.png",alt:"V10",height:"30"})})]}),(0,r.jsxs)("tr",{children:[(0,r.jsx)("td",{children:"30"}),(0,r.jsx)("td",{rowSpan:"7"}),(0,r.jsx)("td",{children:(0,r.jsx)(c,{src:"https://upload.wikimedia.org/wikipedia/en/thumb/1/14/SD_UHS_Speed_Class_3.svg/40px-SD_UHS_Speed_Class_3.svg.png",alt:"U3"})}),(0,r.jsx)("td",{children:(0,r.jsx)(c,{src:"https://upload.wikimedia.org/wikipedia/en/thumb/9/98/SD_Video_Speed_Class_30.svg/60px-SD_Video_Speed_Class_30.svg.png",alt:"V30",height:"30"})}),(0,r.jsx)("td",{rowSpan:"7",style:{backgroundColor:"var(--ifm-color-success)"},children:(0,r.jsx)(e.p,{children:"Yes"})})]}),(0,r.jsxs)("tr",{children:[(0,r.jsx)("td",{children:"60"}),(0,r.jsx)("td",{rowSpan:"6"}),(0,r.jsx)("td",{children:(0,r.jsx)(c,{src:"https://upload.wikimedia.org/wikipedia/en/thumb/1/15/SD_Video_Speed_Class_60.svg/60px-SD_Video_Speed_Class_60.svg.png",alt:"V60",height:"30"})})]}),(0,r.jsxs)("tr",{children:[(0,r.jsx)("td",{children:"90"}),(0,r.jsx)("td",{children:(0,r.jsx)(c,{src:"https://upload.wikimedia.org/wikipedia/en/thumb/b/b3/SD_Video_Speed_Class_90.svg/60px-SD_Video_Speed_Class_90.svg.png",alt:"V90",height:"30"})})]}),(0,r.jsxs)("tr",{children:[(0,r.jsx)("td",{children:"150"}),(0,r.jsx)("td",{rowSpan:"4"}),(0,r.jsx)("td",{children:(0,r.jsx)(c,{src:"https://upload.wikimedia.org/wikipedia/commons/thumb/0/03/SD_Express_Class_150.svg/60px-SD_Express_Class_150.svg.png",alt:"E150"})})]}),(0,r.jsxs)("tr",{children:[(0,r.jsx)("td",{children:"300"}),(0,r.jsx)("td",{children:(0,r.jsx)(c,{src:"https://upload.wikimedia.org/wikipedia/commons/thumb/4/47/SD_Express_Class_300.svg/60px-SD_Express_Class_300.svg.png",alt:"E300"})})]}),(0,r.jsxs)("tr",{children:[(0,r.jsx)("td",{children:"450"}),(0,r.jsx)("td",{children:(0,r.jsx)(c,{src:"https://upload.wikimedia.org/wikipedia/commons/thumb/2/2b/SD_Express_Class_450.svg/60px-SD_Express_Class_450.svg.png",alt:"E450"})})]}),(0,r.jsxs)("tr",{children:[(0,r.jsx)("td",{children:"600"}),(0,r.jsx)("td",{children:(0,r.jsx)(c,{src:"https://upload.wikimedia.org/wikipedia/commons/thumb/8/8c/SD_Express_Class_600.svg/60px-SD_Express_Class_600.svg.png",alt:"E600"})})]})]})]}),"\n",(0,r.jsx)(e.h2,{id:"application-performance-classes",children:"Application Performance Classes"}),"\n",(0,r.jsxs)(e.p,{children:["Earlier SD card speed ratings focused on sequential read and write performance, which is important when transferring large files. However, running apps and operating systems involves frequent access to many small files\u2014a pattern known as ",(0,r.jsx)(e.strong,{children:"random access"}),"\u2014which places different demands on storage, in which case a new performance metric became necessary. To address this, the SD Association introduced ",(0,r.jsx)(e.strong,{children:"Application Performance Classes"}),"."]}),"\n",(0,r.jsxs)("table",{children:[(0,r.jsxs)("thead",{children:[(0,r.jsxs)("tr",{children:[(0,r.jsx)("th",{rowSpan:"2",children:"Class"}),(0,r.jsx)("th",{colSpan:"2",children:"Minimum random IOPS"}),(0,r.jsx)("th",{rowSpan:"2",children:"Minimum sustained sequential writing"}),(0,r.jsx)("th",{rowSpan:"2",children:"When introduced"})]}),(0,r.jsxs)("tr",{children:[(0,r.jsx)("th",{children:"Read"}),(0,r.jsx)("th",{children:"Write"})]})]}),(0,r.jsxs)("tbody",{children:[(0,r.jsxs)("tr",{children:[(0,r.jsx)("th",{children:(0,r.jsx)(c,{src:"https://upload.wikimedia.org/wikipedia/en/thumb/b/b4/SD_App_Performance_1.svg/60px-SD_App_Performance_1.svg.png",alt:"A1"})}),(0,r.jsx)("td",{children:"1,500"}),(0,r.jsx)("td",{children:"500"}),(0,r.jsx)("td",{rowSpan:"2",children:"10 MB/s"}),(0,r.jsx)("td",{children:"November 2016"})]}),(0,r.jsxs)("tr",{children:[(0,r.jsx)("th",{children:(0,r.jsx)(c,{src:"https://upload.wikimedia.org/wikipedia/en/thumb/c/c7/SD_App_Performance_2.svg/60px-SD_App_Performance_2.svg.png",alt:"A2"})}),(0,r.jsx)("td",{children:"4,000"}),(0,r.jsx)("td",{children:"2,000"}),(0,r.jsx)("td",{children:"February 2017"})]})]})]}),"\n",(0,r.jsx)(e.h2,{id:"references",children:"References"}),"\n",(0,r.jsxs)(e.ul,{children:["\n",(0,r.jsx)(e.li,{children:(0,r.jsx)(e.a,{href:"https://en.wikipedia.org/wiki/SD_card",children:"SD card - Wikipedia"})}),"\n",(0,r.jsx)(e.li,{children:(0,r.jsx)(e.a,{href:"https://www.kingston.com/en/blog/personal-storage/memory-card-speed-classes",children:"A guide to speed classes for SD and microSD Cards - Kingston Technology"})}),"\n"]})]})}function j(s={}){let{wrapper:e}={...(0,n.R)(),...s.components};return e?(0,r.jsx)(e,{...s,children:(0,r.jsx)(x,{...s})}):x(s)}},28453(s,e,i){i.d(e,{R:()=>t,x:()=>a});var d=i(96540);let r={},n=d.createContext(r);function t(s){let e=d.useContext(n);return d.useMemo(function(){return"function"==typeof s?s(e):{...e,...s}},[e,s])}function a(s){let e;return e=s.disableParentContext?"function"==typeof s.components?s.components(r):s.components||r:t(s.components),d.createElement(n.Provider,{value:e},s.children)}}}]);
Line numbers count LF bytes from the start of the resource, as the search results do. Vendor segments are library code the classifier recognised; they are stored but not indexed. Bytes are shown as Latin1 characters, one per byte.