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1、SD卡读写关键是对SD的初始化、块扇区的读写、以及SD卡文件结构的掌握,0x59 应答0x01进入空闲模式初始化SD首先发送0x400x000x000x000x00在发送0x410x 00 0x00 0x00 0x00 0x59应答0x00激活SD卡御亲空间1.9G日扇动扇区2.0K00FftTl121K04FAT2121KB246春量备用空闲空涧12.0K03963848Offset0123456789ADCDBFJlj巳使用空间：17MS00000000EB3C904D53相4F53352E300002S的00?悉汕口5.0一缸，1,736,701000000100200020000F0F
2、2003F00PF0020000000?则亲交间-i.g钝00000020E07B3C00000029ID53B6EO4E4F204E41).$多项岫2,027,407,232子节000000304D4520202020464154313620202033C9NEFAT163益计毒量10GB000000408EDLBCF07B8ED9B800208ECOFCBD00K解蛛区？蕾2,0?9,502,46400000050334E247B24SBCl99E83C01T2LCS3EBSA明$)$舞，r.怦:.子节盛3?,7680000006066AlIC7C266&3B07268A57FC75068
3、0CAf?|此.通继.,刺余展印印$000000700288560230C31073BE33C9SA46IQ93FT，堀金灌F.糕,总计籁61,9270000003066160346IC1356IE03兆0E13Dl3D7611.F.d.F一福叫字节原区51200000090608945FC的55FEB82000F7E6犯5E0B03螃V.蝙，可用扁又3,963,320挈一致掘扇区.520OOOOOOAOC348FTF301gFC114EFE61BFDO00E8E6窗色.F?N手7.机.%匪1?4南4OOOOOOBO00723926382D741760Bl0BBEM7DF3A6娥尽标OOOQO
4、OCQ6174324E740983CT203BFB72E6EBDCAOatZNt.以，鲫耕520区，每扇区512字节,使用WinHex分析SD卡可以得到第一数据区即根目录区，在第等等，分析后得结果用于，读数据的验证。本SD卡为1G的金士顿卡，扇区宽度为512字节，根据WinHex和读SD卡的结论得出解读，可以得出表一：扇区地址0x00主引导区MBR0x010x03保留扇区数0x040x040x23FAT表前隐藏扇区数0x200x240x115FAT表1扇区宽度0XF20x1160x207FAT表2扇区宽度0xF20x2080x23932个根目录扇区0X23A数据区Offset012345678
5、9ABCDEF000000000000000000000000000000000000000000000010000000000000000000000000000000000000002000000000000000000000000000000000000000300000000000000000000000000000000000000040000000000000000000000000000000000000005000CIO0000CIO0000000000CIO00000000000000006000000000000000000000OO00000000000000007000
6、000000000000000000CIO00000000000000008000000000000000000000OO00000000000000009000000000000000000000000000000000OOOOOOAO00000000000000000000000000000000OOOOOOBO00000000000000000000000000000000000000C000000000000000000000000000000000000000D000OO0000CIO0000000000OO0000000000000000E000000000000000000000
7、OO0000000000000000F0000000000000Q0000000000000000000000001000000000000000000000000000000000000000110000000000000000000000000000000000000012000000000000000000000000000000000000001300000000000000000000000000000000000000140000000000000000000000000000000000000015000OO0000OO0000000000000000CIO00OO0000016
8、00000000000000000000000000000000000000170000Q00000000Q000000000000000000000000180000000000000000000000000000000000000019000000000000000000000000000000000000001A0000000000000000000000000000000000Q0001B000000000000000000000000000000001000001CO01000629E0F720000000E07B3C000000000001D000000000OO000000000
9、0000000CIO00OOOOOOOIEO00000000OO0000000000000000000000OOOOOIFO000000000000000000000Q00000055AAMBR(主引导的区)的长度为446字节(0x000x1BD),以后每16个字节代表一个分区,共四个，该卡仅一个分区所以后面三个都是空的，这16个就是分区表：地址长度内容详解1BE100激活则为00,否则801BF101分区起始的磁头号1C020100起始扇区和柱面号，低6位时扇区号，？1C2p06分区类型，0B代表FAT32,06代表FAT161C3129分区结束的磁头号1C427FE0分区结束的扇区和柱面号
10、1C6：400000020地址20由该地址读到内容就是逻辑地址的0扇区1CA4003C7BE0分区的总扇区数。493979由上述分析得出本SD卡的逻辑地址的0扇区应该在隐藏扇区中，块的扇区地址为0x00000020,读扇区得到的内容：如下图所示:Offset01234567Z9ABCDEF00000000EB3c904D53444F53352E30OO024。0400?SSD0S5.0.000000100200020000FSF2003F00FF0020000000n*?*ai*00000020EO7D3C00000029ID53B6EO塞4F204E41廓.多NDNA000000304D45
11、20202020464154313620202033C9MEFAT163000000403EDIBCFO7B8ED9B300203ECOFCBDOQ7C螂拣妖？帮J00000050384E247D24SBCl99ES3C0172IC83EB3ASNJ$要集停：0000006066AlIC7c26663B07268A57FC750680CAf?af；.期熊00000070028S5602SOC31073EB33C9SA46109SFT.妁.氾?藉F.惊0000008066160346IC1356IE0346OE13DI8B7611f.止.F.,布v.00000090608946FCB956FEB
12、S2000F7E68B5EOB03,城鼓V.蜃婶一000000A0C348F7F30146FC114EFE61BF0000E8E6命篁.F?N莽？.恍OOQOOOBO00723926332D741760BlOBBEM7BF3A69&8-尽螃OOOOOOCO6174324E740983C7203BFB72E6EBDCAOat2Nt.a;鹘骐薪000GOOD0FB7DB47DSBFOAC984074OC487413MOE察硬幅琪阳t,Ht.?OOOOOOEOBB0700CD10EBEFAOFD7DEBE6AOFC7DEB21艇狙帽旗OOOOOOFOElCD16CD19268B551A52BO01B
13、E0000E3嵬,？出嫁,R?.000001003B0072E8SB8A5624BEOB7CSBFCC746FO一I塞奥$?|搬薜000001103D7DC746F4297D8CD9894EF289非F6C6二舜?厢埴膨N型0000012006967ECBEA03000020OFB6C3663B46FS.柢岁.度碑000001306603非IC66SBDO66ClEA10EB5EOFB6C8f.F,磷邱麦胆.度000001404A4ASA46OD32E4FTE20346FC1356FEEBJJ管2澈?FW000001504A525006536A016A1091SB46IS969233JRP.E
14、j.j.愫F.料300000160D2FTF691FTF64287CAFT761ASAF2SAE8吟籍器B嘴螺.嫉姆00000170COCC02OACCB80102807E02OE7504B442捞谈.-u.磐000001803DF4班5624CD13616172OB4075014203嬲食$?aar,u.B,000001905EOB497506F8C341BB000060666A00EBIU.A7.j.OOOOOIAOBO4E544c4452202020202020ODOA5265痛TLDR-Re000001B06D6F7665206469736B73206F72206F74movedisksorot000001C0686572206D65646g612EFFODOA946973heimedia,DisOOOOOIDO6B206572726F72FFODOA50726573732Qke
