sector

问题 I code a simple program which loads the sector (sector num.2) to the RAM but prints nothing. first, I tried this code for bootsector: org 0x7c00 mov ax, 0x1000 ; ES:BX = 1000:0000 mov es, ax mov bx, 0x00 LoadSectortoMemory: mov al, 0x01 ; Load 1 sectors mov ah, 0x02 ; Load disk data to ES:BX mov cl, 0x02 ; Sector = 2 mov ch, 0x00 ; Cylinder = 0 mov dl, 0x00 ; Drive = 0 mov dh, 0x00 ; Head = 0 int 13h ; Read jc LoadSectortoMemory ; ERROR => Try again jmp 0x1000:0x0000 times 510-($-$$) db 0 dw

问题 I call CreateFile() and I open \\.\PhysicalDrive0 , then I read the sectors of a BitLocker-encrypted volume, and everything works fine. This way I create a backup copy of the physical (encrypted) sectors of a volume that is encrypted with BitLocker. Then, I call CreateFile() again and I open \\.\PhysicalDrive0 again, then I try to write the sectors of said BitLocker-encrypted volume (I'm trying to restore the backup), and it doesn't work. If the volume is unlocked, I get an IOException with

问题 I'm trying to make a sort of pie-chart shape on a canvas element, however I can't seem to find any function that does this by itself. I only seem to be able to draw full circles and segments. Is there an easy way to do this? (See also: Wikipedia on circle terminology) 回答1: The following should work: context.moveTo(cx,cy); context.arc(cx,cy,radius,startangle,endangle); context.lineTo(cx,cy); context.stroke(); // or context.fill() with cx , cy being the center of the arc. 来源： https:/

问题 Before LBA you simply had the physical mapping of a disk, which on originally on an old a IBM-PC compatible machine would look something like this the following: Cylinder Number : (10-bits) 0-1024 (1024 = 2^10) Head Number : (8-bits) 0-256 (256 = 2^8) Sector Number : (6-bits) 0 is reserved typically for the " boot sector " ( c -0, h -0, s -0) 1-64 (63 = 2^6 - 1) *0 is reserved Total CHS address bits : 24-Bits Back in day the average (file|block|sector) size was 512B. Example from wikipedia:

问题 I have the next problem: I'm working with NASM and building some native and compiling it on this way: nasm -f bin source -o out I'm getting my native program for x86. And now the most interesting, how can I make it bootable and then test it? As I think there are 3 ways to make bootable ( but for me, all they has failed :( ) using mkbt utility ( or another soft which is similar ) to write it to floppy disk building ISO image, with editing bootable sector in it manually write memory sector to

问题 I would like to make a sector of a circle on WP7. I tried to do this with the ellipse class and I found a lot of solution, which make a gauge or pie chart or something, but I need just the essence. Could anyone help? the aim is to show just one part of a circle (or ellipse). Like the yellow area in the picture: Thanks, Laci 回答1: Here's a fairly simple solution to the problem, though it does not use an Ellipse and it requires a little trigonometry: <Path Fill="Black" Data="M0,0 L0,-100 A100

问题 I am working on a windows VSS application, I want some help regarding it. After creating snapshot, how can I copy the files or files' blocks(sectors), preferably files' blocks, from volume snapshot using C/C++. Can someone guide me on this or can direct me to any samples or documentation doing the same. Thanks in advance. 回答1: You can access VSS snapshot items using regular functions CreateFile() to open a file ReadFile() or BackupRead() to read/backup its data Only the root path to the items

问题 This is a continuation of my question about reading the superblock. Let's say I want to target the HFS+ file system in Mac OS X. How could I read sector 2 of the boot disk? As far as I know Unix only provides system calls to read from files, which are never stored at that location. Does this require either 1) the program to run kernel mode, or 2) the program to be written in Assembly? I would prefer to avoid either of these restrictions, particularly the latter. 回答1: In Linux, you can read

问题 How can I get the sector size for floppy and CD disks in Linux, via C++ code? Thank you all. 回答1: "#include <hdreg.h>" and use ioctl HDIO_GET_IDENTITY to obtain a struct hd_driveid . On this structure, the x->sector_bytes field is the sector size. #include <stdlib.h> #include <stdio.h> #include <sys/ioctl.h> #include <linux/hdreg.h> #include <fcntl.h> #include <errno.h> #include <string.h> #include <cctype> #include <unistd.h> int main(){ struct hd_driveid id; char *dev = "/dev/hdb"; int fd;

问题 I dropped my laptop while Windows was preparing to hibernate and as a result, I got a head crash on the hard drive. (Teaches me to get a hard drive and/or laptop with a freefall sensor next time around.) Anyway, running SpinRite to try to recover the data has resulted in all the spare sectors on the disk to all be all used up for all the recoverable sectors so far. SpinRite is still going right now, but since there won't be anymore spare sectors to be used, I think it'll be a fruitless