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class="z" title="跳转到指定楼层"><img src="static/image/common/fj_btn.png" alt="跳转到指定楼层" class="vm" /></a> </div> <strong> <a href="http://bbs.oecr.com/thread-20397-1-1.html" id="postnum149413" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>1</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon149413" src="static/image/common/online_member.gif" /> <em id="authorposton149413">发表于 2004-5-13 22:23:00</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=20397&page=1&authorid=14425" rel="nofollow">只看该作者</a> <span class="none"><img src="static/image/common/arw_r.gif" class="vm" alt="回帖奖励" /></span> <span class="pipe show">|</span><a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=20397&extra=page%3D1&ordertype=1" class="show">倒序浏览</a> <span class="pipe show">|</span><a href="javascript:;" onclick="readmode($('thread_subject').innerHTML, 149413);" class="show">阅读模式</a> </div> </div> </div><div class="pct"><style type="text/css">.pcb{margin-right:0}</style><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_149413"> <P align=center><FONT size=3><B >记忆卡有没有使用寿命</B></FONT><FONT size=3><B >?</B></FONT><FONT size=2><B ><P> </P></B></FONT></P> <P><FONT size=2> </FONT></P> <P><FONT size=2> 其实不管是Compact flash (CF) 或 Smart media (SM) 或 Memory stick，核心都是Flash ROM (闪存)，不同只是对外联结的界面及包装型态而已。</FONT><FONT size=2><IMG src="http://www.leaderdc.com/sandisk/images/cf512.jpg" border=0></FONT></P> <P><FONT size=2> </FONT><FONT size=2><B > </B>闪存的读取次数是没有限制的，但抹除写入的次数绝对是有限制的，最早期的Flash ROM每一记忆单位只有1000次重复抹写的能力，目前许多已进步至超过10，000次――这里的重复抹写包含了Format(格式化)的操作。以64M的10，000次而言，<a href="http://theory.oecr.com" target="_blank" class="relatedlink">理论</a>上好象也很够本了(等于帮您存过60G的<a href="http://theory.oecr.com" target="_blank" class="relatedlink">资料</a>了)。</FONT></P> <P><FONT size=2> </FONT><FONT size=2>不过问题并不单单只是如此，“删除全部与部分档案有差别吗?”是一个很专业的问题。<B ><P> </P></B></FONT></P> <P><B ><FONT size=2> </FONT><FONT size=2> </FONT></B><FONT size=2>稍微了解一下计算机及数字相机对待记忆卡的方式，其实较接近pc内的硬盘而非RAM。用过pc media转接卡或USB连接线的人一定知道win98 会多出一台"抽取式硬盘"，所以记忆卡中会像硬盘一样有一个俗称"激活区"和"目录区"的结构区域，之后才是储存档案内容的"区段"。激活区位置是由硬件(即记忆卡规格)所决定的，一般是固定不变的，在硬盘上，激活区固定在第0轨，此处一但损毁就算其它地方都是好的也没用了。</FONT></P> <P><FONT size=2> </FONT><FONT size=2>激活区将指针指向目录区，目录区让计算机或数字相机知道档案结构，简单说就是档案之资料放在那几个区段内，您要读写档案时，由目录区指引计算机或数字相机将资料存取相对应的正确位置，最后，更改之资料是以"区段"做为单位的，有的是4096(4k)B，有的是8192(8K)B为一个"区段"，一个区段中就算只改一个Byte的资料整个区段的4KB也都必须重写。每抹除再写上一次就去掉一次闪存的寿命。</FONT></P></td></tr></table> </div> <div id="comment_149413" class="cm"> </div> <div id="post_rate_div_149413"></div> </div> </div> </td></tr> <tr><td class="plc plm"> <div id="p_btn" class="mtw mbm hm cl"> <a href="http://club.oecr.com/home.php?mod=spacecp&ac=favorite&type=thread&id=20397&formhash=f63fd821" id="k_favorite" onclick="showWindow(this.id, this.href, 'get', 0);" onmouseover="this.title = 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