共2条
1/1 1 跳转至页
问
本人是FLASH MP3的初学者,向各位大侠请教
1已经找到文件名字,扩展名,开始簇号为0002,但在FAT中对应为FFFF,怎么查?
2 FAT 表中为0003或其他数据的,有什么公式可以查开始的数据?
答 1: 怎么没有人理我有没有同道中人,留个联系方式也好啊
QQ 104958515 答 2: 表示当前族是该文件的最后一个族The FAT is an array of up to 65,536 16-bit unsigned integers. The first 2 and last 16 entries in the FAT are reserved. All other elements are of type: index into the FAT array. Each of the non-reserved FAT entries correspond to a cluster on the disk.
FAT index Meaning as index Meaning as value
0x0000 reserved cluster is available
0x0001 reserved undefined
0x0002-0xffef data cluster next cluster in chain is at this index
0xfff0-0xfff6 reserved undefined
0xfff7 reserved bad cluster
0xfff8-0xffff reserved end of the current cluster chain
FAT entries 0x0000 and 0x0001 contain other information, usually 0xfff8 and 0xffff respectively.
The fragment below is from the start of a FAT
FFF8 FFFF 0000 0004 FFFF 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
The fragment above shows a file using clusters 0x0003 & 0x0004.
1已经找到文件名字,扩展名,开始簇号为0002,但在FAT中对应为FFFF,怎么查?
2 FAT 表中为0003或其他数据的,有什么公式可以查开始的数据?
答 1: 怎么没有人理我有没有同道中人,留个联系方式也好啊
QQ 104958515 答 2: 表示当前族是该文件的最后一个族The FAT is an array of up to 65,536 16-bit unsigned integers. The first 2 and last 16 entries in the FAT are reserved. All other elements are of type: index into the FAT array. Each of the non-reserved FAT entries correspond to a cluster on the disk.
FAT index Meaning as index Meaning as value
0x0000 reserved cluster is available
0x0001 reserved undefined
0x0002-0xffef data cluster next cluster in chain is at this index
0xfff0-0xfff6 reserved undefined
0xfff7 reserved bad cluster
0xfff8-0xffff reserved end of the current cluster chain
FAT entries 0x0000 and 0x0001 contain other information, usually 0xfff8 and 0xffff respectively.
The fragment below is from the start of a FAT
FFF8 FFFF 0000 0004 FFFF 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
The fragment above shows a file using clusters 0x0003 & 0x0004.
共2条
1/1 1 跳转至页
回复
有奖活动 | |
---|---|
【有奖活动】分享技术经验,兑换京东卡 | |
话不多说,快进群! | |
请大声喊出:我要开发板! | |
【有奖活动】EEPW网站征稿正在进行时,欢迎踊跃投稿啦 | |
奖!发布技术笔记,技术评测贴换取您心仪的礼品 | |
打赏了!打赏了!打赏了! |
打赏帖 | |
---|---|
与电子爱好者谈读图四被打赏50分 | |
与电子爱好者谈读图二被打赏50分 | |
【FRDM-MCXN947评测】Core1适配运行FreeRtos被打赏50分 | |
【FRDM-MCXN947评测】双核调试被打赏50分 | |
【CPKCORRA8D1B评测】---移植CoreMark被打赏50分 | |
【CPKCORRA8D1B评测】---打开硬件定时器被打赏50分 | |
【FRDM-MCXA156评测】4、CAN loopback模式测试被打赏50分 | |
【CPKcorRA8D1评测】--搭建初始环境被打赏50分 | |
【FRDM-MCXA156评测】3、使用FlexIO模拟UART被打赏50分 | |
【FRDM-MCXA156评测】2、rt-thread MCXA156 BSP制作被打赏50分 |