level 7
⚡天气雷达⚡
楼主
Load:L [address] [drive] [firstsector] [number] or program! (See the N command for more on this) This command will LOAD the selected number of sectors from any disk's Logical Drive under the control of MS-DOS or Windows into Memory. The address is the location in Memory the data will be copied to (use only 4 hex digits to keep it within the memory allocated to DEBUG), the drive number is mapped as: 0=A:, 1=B:, 2=C:, etc., firstsector counts from ZERO to the largest sector in the volume and finally number specifies in hexadecimal the total number of sectors that will be copied into Memory (so a floppy disk with 0 through 2,879 sectors would be: 0 through B3F in Hex). The terms 'Volume' or 'Logical Drive' used in the definition above mean that you can not use the 'L' command to load or examine the MBR, or any other sectors outside of the Primary Volumes or Logical Drive Letters assigned by DOS or Windows! For example (under Windows™ 9x/ME), if you enter the command: L 100 2 0 1 in DEBUG, instead of seeing the very first sector on that hard disk (the MBR), you'll see the first sector of the Boot Record for the Logical drive C: instead (the first partition that can accessed by a compatible MS-DOS or Windows OS). This and the following comments about diskettes, show that DEBUG has always been quite limited compared to a good disk editor or the UNIX 'dd' program.Load can still be useful in examining Floppy Disks even under Windows™ 2000/XP, but (unfortunately), only if the disk can be read by MS-DOS or Windows. Once again, this shows how limited DEBUG is compared to any utility that can view the raw data on either a hard drive or diskette. (For those of you who wish to examine the actual contents of a hard disk under Windows™XP, there are free disk editors, such as HxD, which allow you to do so.)Unlike hard disks, the very first sector on a floppy disk is an OS Boot sector. Here's what you might see from a Logical disk sector and some dumps from a couple floppy disks. Examples:-l 100 2 0 1 [ the C: drive. ]-d 100 10fxxxx:0100 EB 58 90 4D 53 57 49 4E-34 2E 31 00 02 08 20 00 .X.MSWIN4.1... .-d 280 2ffxxxx:0280 01 27 0D 0A 49 6E 76 61-6C 69 64 20 73 79 73 74 .'..Invalid systxxxx:0290 65 6D 20 64 69 73 6B FF-0D 0A 44 69 73 6B 20 49 em disk...Disk Ixxxx:02A0 2F 4F 20 65 72 72 6F 72-FF 0D 0A 52 65 70 6C 61 /O error...Replaxxxx:02B0 63 65 20 74 68 65 20 64-69 73 6B 2C 20 61 6E 64 ce the disk, andxxxx:02C0 20 74 68 65 6E 20 70 72-65 73 73 20 61 6E 79 20 then press anyxxxx:02D0 6B 65 79 0D 0A 00 00 00-49 4F 20 20 20 20 20 20 key.....IOxxxx:02E0 53 59 53 4D 53 44 4F 53-20 20 20 53 59 53 7E 01 SYSMSDOS SYS~.xxxx:02F0 00 57 49 4E 42 4F 4F 54-20 53 59 53 00 00 55 AA .WINBOOT SYS..U.--l 100 0 0 1 [ a floppy in the A: drive. ]-d 100 13dxxxx:0100 EB 3C 90 29 47 38 71 33-49 48 43 00 02 01 01 00 .<.)G8q3IHC.....xxxx:0110 02 E0 00 40 0B F0 09 00-12 00 02 00 00 00 00 00 [email protected]:0120 00 00 00 00 00 00 29 40-16 D8 13 4E 4F 20 4E 41 ......)@...NO NA
2008年05月03日 01点05分
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