http:\/\/en.wikipedia.org\/wiki\/File_Allocation_Table<\/a>\u3002<\/p>\n\u5bf9\u4e8e\u4e00\u4e2aFAT\u7684\u5206\u533a\/\u78c1\u76d8\uff08\u901a\u5e38\u6765\u8bf4\u90fd\u662f\u5206\u533a\uff0c\u4f46\u662f\u8f6f\u76d8\u4e0a\u6ca1\u6709MBR\uff0c\u6240\u4ee5\u8fd9\u65f6\u5019\u5c31\u662f\u78c1\u76d8\u4e86\uff09\uff0c\u4e00\u5f00\u59cb\u662f\u4e00\u4e2a\u5f15\u5bfc\u6247\u533a\uff08DBR\uff09\uff0c\u91cc\u9762\u5305\u542b\u4e86\u4e00\u4e9b\u5f15\u5bfc\u4ee3\u7801\u548cBIOS\u53c2\u6570\u5757\uff08BIOS Parameter Block\uff0cBPB\uff09\u3002
\n\u8fd9\u4e2aDBR\u4ee5\u53ca\u63a5\u4e0b\u6765\u7684\u4e00\u4e9b\u7279\u6b8a\u7528\u9014\u7684\u6247\u533a\uff08\u5982\u679c\u5b58\u5728\u7684\u8bdd\uff09\u90fd\u7b97\u5728BPB\u4e2d\u7684NumberOfReservedSectors\u91cc\u9762\u3002<\/p>\n
\u63a5\u4e0b\u6765\u662fFAT\uff0cFAT\u53ef\u80fd\u6709\u591a\u4e2a\u526f\u672c\u3002\u4f4d\u4e8eBPB\u7684NumberOfFats\u3002\u6bcf\u4e2aFAT\u5360\u7528\u7684\u6247\u533a\u6570\u4f4d\u4e8eBPB\u7684NumberOfSectorsPerFat\u3002
\nFAT\u5176\u5b9e\u662f\u4e00\u4e2a\uff08\u5143\u7d20\u5927\u5c0f\u4e3a12\u4f4d\u7684\uff09\u6570\u7ec4\uff0c\u8fd9\u4e2a\u6570\u7ec4\u7684\u5143\u7d20\u4e0b\u6807\u662f\u78c1\u76d8\u4e0a\u7684\u7c07\u53f7\uff0c\u6bcf\u4e2a\u5143\u7d20\u90fd\u6307\u5411\u53e6\u5916\u4e00\u4e2a\u5143\u7d20\u7684\u4f4d\u7f6e\uff08\u4e5f\u5c31\u662f\u53e6\u5916\u4e00\u4e2a\u4e0b\u6807\u2014\u2014\u4e5f\u5c31\u662f\u7c07\u53f7\uff09\uff0c\u5f62\u6210\u4e00\u4e2a\u94fe\u8868\u3002
\n\u7c07\u7684\u5b9a\u4e49\u662f\u4e00\u4e9b\u8fde\u7eed\u7684\u6247\u533a\uff0c\u5177\u4f53\u6709\u591a\u5c11\u4e2a\u53d6\u51b3\u4e8eBPB\u4e2d\u7684NumberOfSectorsPerCluster\u3002
\n\u6bd4\u5982\u8bf4\u6709\u4e2a\u6587\u4ef6\u5728\u78c1\u76d8\u4e0a\uff0c\u6309\u987a\u5e8f\u4e00\u6b21\u5360\u636e\u4e86\u7c07\u53f7\u4e3a5\u30013\u300110\u30017\u7684\u56db\u4e2a\u7c07\uff08\u6ce8\u610fFAT\u7684\u7b2c0\u548c\u7b2c1\u4e2a\u5143\u7d20\u88ab\u7559\u4f5c\u5b83\u7528\uff08\u7b2c0\u4e2a\u662fBPB\u76840x15\u5904\u7684\u90a3\u4e2a\u5a92\u4ecb\u63cf\u8ff0\u7b26\u2014\u2014\u56e0\u4e3a\u8fd9\u4e2a\u63cf\u8ff0\u7b26\u53ea\u67098\u4f4d\uff0c\u6240\u4ee5\u9ad8\u4f4d\u88651\uff0c\u7b2c1\u4e2a\u662f\u7528\u6765\u6807\u8bc6\u94fe\u8868\u7ed3\u675f\uff08End of Clusterchain\uff0cEOC\uff09\u7684\uff09\uff0c\u56e0\u6b64\u4e0d\u5b58\u5728\u7c070\u548c\u7c071\uff09\u3002
\n\u90a3\u4e48Fat[5] = 3\u3001Fat[3] = 10\u3001Fat[10] = 7\u3001Fat[7] = EOC\u3002\uff08\u6ce8\u610fFat\u4e0d\u662f\u5b57\u7b26\u578b\uff0c\u800c\u662f\u4e00\u79cd12-bit\u7684\u7c7b\u578b\uff09
\n\u4e0d\u8fc7\u5b9e\u9645\u5b9e\u73b0\u4e2d\uff0c\u5176\u5b9e\u4e0d\u662f\u7528\u7b2c0\u4e2a\u5143\u7d20\u6765\u5224\u65adEOC\u7684\uff0c\u53ea\u8981\u5927\u4e8e0xff0\u90fd\u662fEOC\uff08\u53c2\u8003wiki\uff09\u3002
\n\u5982\u679cFAT\u4e2d\u67d0\u4e2a\u5143\u7d20\u4e3a0\uff0c\u90a3\u4e48\u8bf4\u660e\u8fd9\u4e2a\u7c07\u662f\u7a7a\u95f2\u7684\u3002
\n\u6ce8\u610f\u4ece\u7c07\u8f6c\u6362\u5230\u6247\u533a\u53f7\u5e94\u5f53\u662f(ClusterNumber – 2) * NumberOfSectorsPerCluster + \u6570\u636e\u533a\u8d77\u59cb\u4f4d\u7f6e\uff08\u53c2\u8003\u540e\u6587\uff09\u3002<\/p>\n
\u7136\u540e\u662f\u6839\u76ee\u5f55\u3002\u6839\u76ee\u5f55\u5176\u5b9e\u662f\u4e00\u4e2a\u5143\u7d20\u4e3a0x20\u5927\u5c0f\u7684\u6570\u7ec4\uff0c\u5143\u7d20\u4e2a\u6570\u53d6\u51b3\u4e8eBPB\u4e2d\u7684RootEntries\u3002\u8fd9\u4e9b\u5143\u7d20\u4e5f\u5c31\u662f\u4e00\u4e2a\u4e2a\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002\u6bcf\u4e2a\u5143\u7d20\u524d11\u5b57\u8282\u662f8.3\u683c\u5f0f\u7684\u6587\u4ef6\u540d\uff08\u4e0d\u542b\u70b9\u53f7\uff0c\u5982\u679c\u4e0d\u591f8\/3\u7684\u957f\u5ea6\uff0c\u7528\u7a7a\u683c\u8865\u9f50\u3002\u53e6\u5916\uff0c\u957f\u6587\u4ef6\u540d\uff08Long File Names\uff0cLFN\uff09\u5176\u5b9e\u662f\u7528\u5229\u7528\u4e0d\u5408\u6cd5\u7684\u6587\u4ef6\u9879\u5b9e\u73b0\u7684\u2014\u2014\u4e00\u79cd\u53ea\u8bfb\u3001\u7cfb\u7edf\u3001\u9690\u85cf\u7684\u5377\u6807\u578b\u6587\u4ef6\uff0c\u7136\u540e\u5229\u7528\u9879\u4e2d\u7684\u5176\u4ed6\uff08\u7edd\u5927\u591a\u6570\uff09\u57df\u4e13\u95e8\u5b58\u6587\u4ef6\u540d\u2014\u2014\u8fd9\u79cd\u4e0d\u5408\u6cd5\u7684\u6587\u4ef6\u9879\u4f1a\u91cd\u590d\u591a\u6b21\uff08\u5982\u679c\u6587\u4ef6\u540d\u5f88\u957f\uff09\uff0c\u7136\u540e\u7d27\u63a5\u7740\u662f\u8fd9\u4e2aLFN\u5bf9\u5e94\u7684\u771f\u6b63\u7684\u6587\u4ef6\u9879\uff09\uff0c\u7136\u540e\u662f\u6587\u4ef6\u5c5e\u6027\uff08\u9690\u85cf\/\u7cfb\u7edf\/\u53ea\u8bfb\u7b49\uff09\uff0c\u63a5\u4e0b\u6765\u662f\u4e00\u4e9b\u65e5\u671f\u65f6\u95f4\uff08\u521b\u5efa\/\u6700\u540e\u4fee\u6539\uff09\u7b49\uff0c\u63a5\u4e0b\u6765\u5728\u504f\u79fb0x1a\u5904\u6807\u8bc6\u4e86\u6587\u4ef6\u7684\u7b2c\u4e00\u4e2a\u7c07\u53f7\u3002\u7d27\u63a5\u7740\u662f\u6587\u4ef6\u5927\u5c0f\u3002<\/p>\n
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