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class="sp1 c6 fl"><em id="zuozhe" class="noshow">春健</em><em class="user_id noshow">736</em>由 <em class="nickname"></em> 分享</span> <span id="8hh5rq1ip" class="fl arc_btn"></span> </div> </div> </div> <div id="8hh5rq1ip" class="y_ju"></div> <div id="8hh5rq1ip" class="con_article con_main" id="contentText"> <p>怎樣識(shí)別內(nèi)存卡的真?zhèn)?/p><p> 　　有網(wǎng)友在某網(wǎng)店看到了金士頓TF內(nèi)存卡的促銷信息，16GB的35元，32GB的100元，與市場均價(jià)相比確實(shí)便宜很多，而后他就各買了一張。不過，對(duì)于如此便宜的內(nèi)存卡他也產(chǎn)生了疑問，那么怎樣識(shí)別內(nèi)存卡的真?zhèn)?學(xué)習(xí)啦小編教大家一招怎樣識(shí)別內(nèi)存卡的真?zhèn)蔚姆椒ǎ瑒e再受促銷的小便宜了。</p><p><strong>　　怎樣識(shí)別內(nèi)存卡的真?zhèn)?/strong></p><p> 　　此位網(wǎng)友在購買后第一時(shí)間就通過金士頓官網(wǎng)查詢了內(nèi)存卡包裝上的防偽碼，經(jīng)驗(yàn)證確實(shí)是正品。但在使用了一段時(shí)間后就發(fā)現(xiàn)自己的內(nèi)存卡讀寫速度比別人的要慢很多，而且在復(fù)制比較大的文件時(shí)會(huì)提示錯(cuò)誤，隨后他從網(wǎng)上下載了一個(gè)內(nèi)存卡檢測工具，最終測試結(jié)果表明這兩張內(nèi)存卡的實(shí)際容量都只有2GB。</p><p> 　　或許大家會(huì)感到疑惑，2GB的內(nèi)存卡怎么能變成16GB和32GB呢?其實(shí)，他買的這種內(nèi)存卡被稱為“擴(kuò)容卡”，在行業(yè)內(nèi)部早已不是什么秘密，這也是山寨廠家和奸商最常用的牟利手段。一般來說，用一張十幾二十元的2GB內(nèi)存卡擴(kuò)容成16GB或32GB，然后以低價(jià)吸引消費(fèi)者購買，其中的利潤翻了好幾倍。針對(duì)這個(gè)情況，現(xiàn)在就為各位普及一下內(nèi)存卡的基礎(chǔ)知識(shí)，同時(shí)再教大家?guī)讉€(gè)簡單的鑒別方法，以避免購買時(shí)上當(dāng)受騙。</p><p> 　　內(nèi)存卡的前世今生。</p><p> 　　回想當(dāng)年，大家都還在用著非智能機(jī)，由于功能單一，需要存儲(chǔ)的數(shù)據(jù)也就是通訊錄和短信。雖然那時(shí)也有手機(jī)游戲，但大多都是幾十KB，并不需要太大的存儲(chǔ)空間。但隨著手機(jī)功能的多樣化，尤其是音樂、拍照、視頻元素的加入，原本充裕的內(nèi)存也變得緊張起來，有一部分手機(jī)選擇了擴(kuò)大機(jī)身內(nèi)存，但大多數(shù)手機(jī)廠商還是選擇內(nèi)存卡擴(kuò)展空間的方式。</p><p> 　　雖然大家每天都在使用，但早期的手機(jī)內(nèi)存卡并不是現(xiàn)在這樣“嬌小”的造型，而且容量也沒有那么大。其中MMC內(nèi)存卡算是比較早的一種，它是在1997年由西門子及SanDisk共同開發(fā)而成，基于東芝的NAND快閃記憶技術(shù)，比采用IntelNOR快閃記憶技術(shù)的CF卡更細(xì)小。當(dāng)初MMC卡應(yīng)用較為廣泛，數(shù)碼相機(jī)、PDA、手機(jī)都可以使用，其中諾基亞采用MMC內(nèi)存卡的機(jī)型相對(duì)較多。</p><p> 　　之后，SD內(nèi)存卡開始興起，它是由日本松下、東芝及美國SanDisk公司于1999年8月共同開發(fā)研制。SD內(nèi)存卡是一種基于半導(dǎo)體快閃記憶器的新一代存儲(chǔ)設(shè)備，它被廣泛地用于便攜式裝置上，并且擁有高記憶容量、快速數(shù)據(jù)傳輸率、極大的移動(dòng)靈活性以及很好的安全性。雖說SD內(nèi)存卡很快的取代了MMC內(nèi)存卡的位置，并且一直沿用至今，但實(shí)際上它也是基于MMC格式發(fā)展而來，兩者在一些設(shè)備上還具有一定的兼容性。</p><p align="center"> 　　32GTF內(nèi)存卡</p><p> 　　上圖就是現(xiàn)在最為常見的TF內(nèi)存卡，它是由SanDisk公司研制，主要用于手機(jī)設(shè)備，相比早期的MMC內(nèi)存卡它的體積更小，容量更大，而且兼容性強(qiáng)。通過卡托就可以轉(zhuǎn)換為SD卡，擴(kuò)展性極強(qiáng)，在2004年它被SD協(xié)會(huì)正式更名為Micro SD。</p><p><strong>　　2GB變32GB 擴(kuò)容卡內(nèi)幕大曝光</strong></p><p> 　　現(xiàn)在市場銷售的不少TF內(nèi)存卡的實(shí)際存儲(chǔ)空間與標(biāo)稱并不相符，像2GB變32GB、4GB變32GB的情況比比皆是。而所謂擴(kuò)容卡就是擴(kuò)展電子設(shè)備容量的存儲(chǔ)介質(zhì)，例如手機(jī)、MP3、MP4、數(shù)碼相機(jī)、U盤、CF內(nèi)存卡、SD內(nèi)存卡、TF內(nèi)存卡等等，這些都可以被擴(kuò)容。尤其是現(xiàn)在最常用的TF內(nèi)存卡，擴(kuò)容現(xiàn)象最為嚴(yán)重，主要集中在金士頓、SanDisk這兩個(gè)品牌。</p><p> 　　其實(shí)，對(duì)于購買擴(kuò)容卡的消費(fèi)者來說，損失點(diǎn)錢倒是小事，畢竟內(nèi)存卡頂多也就200多元，而它最大的危害則是在數(shù)據(jù)安全方面。一般來說，擴(kuò)容卡在復(fù)制一些文件的時(shí)候會(huì)出現(xiàn)錯(cuò)誤提示，因?yàn)閿U(kuò)展出來的空間并不算真正意義上的內(nèi)存。當(dāng)然，出現(xiàn)報(bào)錯(cuò)也需要一定條件，這也是很多朋友在購買到擴(kuò)容卡后長時(shí)間沒有發(fā)現(xiàn)問題的原因。</p><p> 　　例如，一張2GB內(nèi)存卡擴(kuò)容到了32GB，當(dāng)我們將它連接到電腦上，通過屬性是不會(huì)發(fā)現(xiàn)有問題的。如果我們復(fù)制總?cè)萘繛?GB的1000首歌曲，這時(shí)內(nèi)存卡一般不會(huì)有什么異樣，報(bào)錯(cuò)的幾率比較小，因?yàn)槊渴赘枨拇笮H為幾MB。但是，當(dāng)我們復(fù)制一部容量為3GB的高清電影時(shí)，這張擴(kuò)容卡就會(huì)出現(xiàn)報(bào)錯(cuò)提示，因?yàn)檫@時(shí)單個(gè)文件的大小已經(jīng)超過了內(nèi)存卡的實(shí)際容量，這種情況是無法傳輸數(shù)據(jù)的。</p><p><strong>　　真假內(nèi)存卡辨別方法</strong></p><p> 　　雖說復(fù)制1000首歌曲很少出現(xiàn)報(bào)錯(cuò)，但由于擴(kuò)容的部分并不穩(wěn)定，很容易出現(xiàn)數(shù)據(jù)丟失的問題。同時(shí)，擴(kuò)容會(huì)導(dǎo)致內(nèi)存卡使用壽命減少，甚至直接燒壞，最后連格式化都無法進(jìn)行，容量只顯示為8MB或者16MB，而且還無法打開。還有一種情況就是，將文件復(fù)制進(jìn)去，當(dāng)時(shí)打開一般沒問題，但只要更換電腦或者重啟的話就會(huì)出現(xiàn)數(shù)據(jù)丟失或者報(bào)錯(cuò)，這是因?yàn)橄到y(tǒng)會(huì)優(yōu)先讀取本地磁盤的緩存文件。由此可以看出擴(kuò)容卡的危害之嚴(yán)重，如果卡內(nèi)文件十分重要的話，一旦丟失將很難找回。</p><p><strong>　　SanDisk官方也生產(chǎn)擴(kuò)容卡?</strong></p><p> 　　看到題目大家肯定會(huì)疑惑，SanDisk官方怎么可能生產(chǎn)擴(kuò)容卡?其實(shí)此“擴(kuò)容卡”非彼擴(kuò)容卡，這其中又涉及到一個(gè)存儲(chǔ)單元芯片的問題。一般來說，Nand閃存主要分為MLC多層存儲(chǔ)單元、SLC單層存儲(chǔ)單元和TLC三種類別，這三種類別也分別適用于不同的使用環(huán)境，最常見的就是MLC和SLC，SanDisk使用的就是MLC。</p><p> 　　MLC是Multi-Level Cell多層存儲(chǔ)單元的縮寫，它的最大特點(diǎn)就是容量大成本低，但是速度卻很慢。MLC的每個(gè)單元為2bit，相對(duì)SLC來說整整多了一倍。也就是說，同樣100個(gè)單元，MLC就要比SLC的容量大很多，通常制造128MB的內(nèi)存卡需要用1024個(gè)單位的晶圓顆粒，而SanDisk來制造同樣的內(nèi)存卡只需要用512個(gè)單位的晶圓顆粒，這其實(shí)就相當(dāng)于變相的“擴(kuò)容”。雖然這樣可以降低成本，但卻犧牲了速度，由于每個(gè)MLC存儲(chǔ)單元中存放的數(shù)據(jù)過多，結(jié)構(gòu)相對(duì)復(fù)雜，出錯(cuò)的幾率也相對(duì)增加，必須進(jìn)行錯(cuò)誤修正，同時(shí)MLC的擦寫壽命僅為5000-10000次。而很多消費(fèi)者卻不知道這一點(diǎn)，SanDisk超高的知名度掩蓋了其產(chǎn)品上的“瑕疵”。</p><p> 　　SLC是Single Layer Cell單層存儲(chǔ)單元的縮寫，它的最大特點(diǎn)就是穩(wěn)定、速度快、功耗低，但相比MLC容量要小一半，成本也相對(duì)較高。SLC的每個(gè)單元為1bit，其存儲(chǔ)單元中存放的數(shù)據(jù)較少，結(jié)構(gòu)相對(duì)簡單，出錯(cuò)的幾率也大大降低。而且，SLC閃存的復(fù)寫次數(shù)高達(dá)100000次，是MLC的10-20倍，它經(jīng)常被用在企業(yè)級(jí)SSD上，但同樣SLC的成本也較MLC高出三倍有余。</p><p> 　　在了解了MLC和SLC的區(qū)別及優(yōu)缺點(diǎn)之后，相信有不少朋友會(huì)問，現(xiàn)在有哪個(gè)品牌的內(nèi)存卡在使用SLC呢?其實(shí)這個(gè)品牌的國際知名度絲毫不亞于SanDisk，它就是PNY(必恩威)。它是美國第二大內(nèi)存卡廠商，也是美國通路市場第一大品牌，而且它在歐洲的市場占有率極高，國內(nèi)也有銷售，只不過很多消費(fèi)者不了解罷了。其內(nèi)存卡產(chǎn)品采用SLC制成，也是市場上為數(shù)不多的高速卡。</p><p><strong>　　從外觀初識(shí)真假。</strong></p><p> 　　一般來說，購買內(nèi)存卡之后，我們首先要做的就是辨別這張內(nèi)存卡的真假，也就是說先要確定它是不是你買的那個(gè)廠商生產(chǎn)的。雖說擴(kuò)容卡在將容量擴(kuò)展后會(huì)更改內(nèi)存卡上相應(yīng)的容量標(biāo)識(shí)，但至少要保證這張卡是原廠生產(chǎn)，因?yàn)槿绻龅搅藷o法退換的情況，我們至少還可以將內(nèi)存卡還原為實(shí)際容量，這樣的話大品牌內(nèi)存卡總要比雜牌或者山寨的要好。</p><p> 　　網(wǎng)上也有不少關(guān)于內(nèi)存卡的鑒別文章，但大多都是通過包裝、防偽碼來進(jìn)行分辨。其實(shí)，這種方法現(xiàn)在看來已經(jīng)不是很靠譜，因?yàn)槭袌鲋杏胁簧偕碳以诨厥瞻b。除此之外，現(xiàn)在的高仿包裝已經(jīng)可以做到以假亂真的地步，就連背后的防偽碼都可以制作，這些假編碼同樣可以在官網(wǎng)查詢到，足見奸商們的手段之高。所以相對(duì)保險(xiǎn)的方法就是對(duì)內(nèi)存卡本身進(jìn)行鑒別，下面我們就拿時(shí)下熱銷的金士頓TF卡來做一下鑒別。先來看一下正面，主要關(guān)注兩個(gè)點(diǎn)，一是中間的激光碼，二是底部的凹槽。一般假卡的激光碼刻字會(huì)出現(xiàn)模糊、字號(hào)不統(tǒng)一、編碼間隔不均勻的問題，而真卡則不會(huì)出現(xiàn)這種情況。另外，真的金士頓TF卡正面左下方會(huì)有一個(gè)圓形凹槽，假卡一般則沒有。</p><p> 　　看儲(chǔ)存卡的背面，這也是較容易的方法。原裝金士頓TF卡背面每個(gè)銅片下方都會(huì)有一個(gè)明顯的銅點(diǎn)，而高仿金士頓TF卡則沒有這個(gè)銅點(diǎn)。出現(xiàn)這種差別的原因就是山寨廠商的技術(shù)和工藝還無法達(dá)到如此高的水平。</p><p><strong>　　擴(kuò)容卡及壞塊檢測。</strong></p><p> 　　當(dāng)然，通過內(nèi)存卡的外觀我們只能簡單的判斷它是否為正品，但卻不能鑒定它是不是擴(kuò)容卡。要想知道你買的內(nèi)存卡是否被擴(kuò)容，那么就需要用特定的測試工具M(jìn)yDiskTest(點(diǎn)此下載)。它是一款集5大功能于一身的移動(dòng)存儲(chǔ)產(chǎn)品擴(kuò)容識(shí)別工具，通過它可以方便的檢測出存儲(chǔ)設(shè)備是否經(jīng)過擴(kuò)充容量。同時(shí)也能查出存儲(chǔ)設(shè)備是否有壞塊，是否采用黑片，它不會(huì)破壞磁盤原有數(shù)據(jù)，并可以測試讀取和寫入速度。</p><p><strong>　　快速讀寫檢測</strong></p><p> 　　進(jìn)行完上面的檢測后，我們就可以斷定自己買的內(nèi)存卡是否被擴(kuò)容，如果是擴(kuò)容卡的話就需要將其恢復(fù)到實(shí)際容量，以免在使用時(shí)丟失數(shù)據(jù)。如果不是的話，那么我們還需要回到第一個(gè)問題，即內(nèi)存卡是否為正品。雖說過了外觀和擴(kuò)容檢測這兩關(guān)，但還不足以證明內(nèi)存卡的真假，最后，我們還要對(duì)卡速進(jìn)行一下測試，使用的依舊是MyDiskTest檢測工具。</p><p> 　　相比擴(kuò)容檢測，內(nèi)存卡的讀寫速度測試就更為容易，只需在軟件主界面點(diǎn)擊速度測試，然后按開始就可以了。這時(shí)會(huì)跳轉(zhuǎn)到上圖中的界面，點(diǎn)擊右上角的開始測試就會(huì)進(jìn)行檢測，時(shí)間也是5分鐘左右。其中最上面兩大塊分別為測試項(xiàng)目和平均讀寫速度。而下方的縱軸表示讀寫速度，橫軸表示容量大小。中間的數(shù)個(gè)綠色數(shù)軸為讀取速度，紅色為寫入速度，待上圖界面完全出現(xiàn)后就可以點(diǎn)擊關(guān)閉了。</p><p align="center"> 　　內(nèi)存卡快速讀寫檢測辨別真假</p><p> 　　關(guān)閉后就會(huì)跳轉(zhuǎn)到MyDiskTest的主界面，最終測試結(jié)果包括物理操作速度、創(chuàng)建文件速度、刪除文件速度、隨機(jī)讀寫速度、文件復(fù)制速度。得到這些數(shù)值后，就可以去該內(nèi)存卡的官網(wǎng)查找資料，一般品牌內(nèi)存卡官網(wǎng)都會(huì)提供產(chǎn)品的讀寫速度，當(dāng)然大多都是平均值和最低值，兩相對(duì)比后，只要差距不是太大就可以確定為原裝無擴(kuò)容內(nèi)存卡。</p><p> 　　文至于此，相信大家對(duì)于手機(jī)內(nèi)存卡的一些基礎(chǔ)知識(shí)和鑒別方法已經(jīng)有了一個(gè)大致的了解。擴(kuò)容卡的危害還是比較嚴(yán)重的，如果將重要數(shù)據(jù)放在這種內(nèi)存卡中就很容易出現(xiàn)丟失的情況，那時(shí)候損失的就不僅僅是一兩百塊錢了，文件很有可能因此無法找回。其實(shí)想避免類似情況發(fā)生也并不困難：首先，不能貪圖小便宜，本來一張內(nèi)存卡就沒有多少錢，所以盡量從正規(guī)商家或者網(wǎng)站購買;其次，購買時(shí)要先對(duì)外觀進(jìn)行辨別，僅僅知道方法還不夠，最重要的依舊是細(xì)心和耐心;第三，購買之后一定要先用軟件對(duì)內(nèi)存卡進(jìn)行測試，確認(rèn)無誤后再行使用。</p> </div> <div id="8hh5rq1ip" class="y_ju"></div> <div id="8hh5rq1ip" class="pnum"> <ul id="page_slice"> <div id="8hh5rq1ip" class="clear"></div> </ul> </div> </article> <div id="8hh5rq1ip" class="list_hot ar_related bj_mt20 louti"> <h4 class="title2 title2_te">相關(guān)文章</h4> <ul class="bj_mt20"> <li id="8hh5rq1ip" class="lb_3 chao"> <time>02-08</time> <a href="http://wyyxscd8644.com/diannao/guzhang/neicun/54988.html" title="微機(jī)內(nèi)存常見故障及解決辦法" target="_blank">微機(jī)內(nèi)存常見故障及解決辦法</a> </li> <li id="8hh5rq1ip" class="lb_3 chao"> <time>02-08</time> <a 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