Sponsored Content
Operating Systems Linux C++ Code to Access Linux Hard Disk Sectors (with a LoopBack Virtual Hard Disk) Post 302491460 by Corona688 on Thursday 27th of January 2011 01:38:15 PM
Old 01-27-2011
Quote:
Originally Posted by shen747
Hi Corona688,

Thank you very very much for the immense support you've given me throughout this thread. I've learned a lot from you since I started this thread Smilie. I understand what I should do and how I should proceed. Thanks you very much sir.

I've tried the HexDump Command you gave me on my Virtual MS-DOS(FAT-16) Floppy Drive & as follows :
Your virtual floppy disk, like any floppy disk, is FAT12, not FAT16. Look closely at your dump:
Code:
00000000  eb 3c 90 6d 6b 64 6f 73  66 73 00 00 02 01 01 00  |.<.mkdosfs......|
00000010  02 e0 00 40 0b f0 09 00  12 00 02 00 00 00 00 00  |...@............|
00000020  00 00 00 00 00 00 29 26  7a d7 50 20 20 20 20 20  |......)&z.P     |
00000030  20 20 20 20 20 20 46 41  54 31 32 20 20 20 0e 1f  |      FAT12   ..|
00000040  be 5b 7c ac 22 c0 74 0b  56 b4 0e bb 07 00 cd 10  |.[|.".t.V.......|
00000050  5e eb f0 32 e4 cd 16 cd  19 eb fe 54 68 69 73 20  |^..2.......This |
00000060  69 73 20 6e 6f 74 20 61  20 62 6f 6f 74 61 62 6c  |is not a bootabl|
00000070  65 20 64 69 73 6b 2e 20  20 50 6c 65 61 73 65 20  |e disk.  Please |
00000080  69 6e 73 65 72 74 20 61  20 62 6f 6f 74 61 62 6c  |insert a bootabl|
00000090  65 20 66 6c 6f 70 70 79  20 61 6e 64 0d 0a 70 72  |e floppy and..pr|

To make a FAT16 partition you might want to use the instructions I gave you on a blank file of a couple megabytes in size.

You don't need to use the loop device for anything but mounting the partition (something you intend to avoid doing anyway). As far as mkfs.msdos, read(), and write() are concerned they act the same.

Last edited by Corona688; 01-27-2011 at 02:44 PM..
This User Gave Thanks to Corona688 For This Post:
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

hard disk problems

Hi all I am facing a strange problem. I am using a sun ultra10 spark machine. first i took a 20gb IDE hard disk and installed solaris 5.8. But due to some requirement i have to reinstall the OS but this time solaris 2.6. and now the hard disk capacity is only showing 8gb. Where the 12gb... (3 Replies)
Discussion started by: Prafulla
3 Replies

2. Filesystems, Disks and Memory

hard disk meltdown

I had an issue with a second hard disk in my machine. I have a sparc station running solaris 7. It was working fine but now it wont mount on boot up and when you try to mount it manually it gives an I/O error. I tried a different disk as a control which was fine. What I want to know is if my... (3 Replies)
Discussion started by: Henrik
3 Replies

3. Filesystems, Disks and Memory

Adding hard Disk

Hi all, I am using SCO Openserver V and I want to add one more harddisk (/dev/hd1) Hw can I do it? (1 Reply)
Discussion started by: skant
1 Replies

4. UNIX Desktop Questions & Answers

Hard Disk

I have a cuestion. How Can I to add other hard disk to my computer? I need to configurate anyone? (4 Replies)
Discussion started by: hmaraver
4 Replies

5. UNIX for Dummies Questions & Answers

Hard Disk Check

How can we check the number of hard disks (both internal & external) in a server, their capacity and serial number (5 Replies)
Discussion started by: muneebr
5 Replies

6. UNIX for Dummies Questions & Answers

Hard Disk at 99% Help!

:eek: I use this Solaris to run CMS a call acounting software package for my job. No one could run reports today because it said the this when you logged on "The following file systems are low, and could adversely affect server performance: File system /: 99%full" Can some one please explain... (9 Replies)
Discussion started by: mannyisme
9 Replies

7. UNIX for Dummies Questions & Answers

How to increase hard disk in linux

Hi guys i have created a linux machine in virtual box now i want to add some hard disk space into it. How would i do this. Please help. Machine details are as below # lsb_release -a LSB Version: :core-3.1-ia32:core-3.1-noarch:graphics-3.1-ia32:graphics-3.1-noarch Distributor ID:... (7 Replies)
Discussion started by: pinga123
7 Replies

8. SCO

declare disk driver for IDE hard disk

hi I've a fresh installation of SCO 5.0.7 on the IDE hard disk. For SCSI hard disk I can declare, for example blc disk driver using: # mkdev hd 0 SCSI-0 0 blc 0but it works for IDE hard disk? (3 Replies)
Discussion started by: ccc
3 Replies

9. Red Hat

Need help for getting hard-disk traces

When we write a programme,we declare variables and compiler allocates memory to them.I want to get access to the physical block number of hard-disk where actually the data is stored by the programme " Some one help me out... (1 Reply)
Discussion started by: nagraz007
1 Replies

10. UNIX for Advanced & Expert Users

Need help for getting hard-disk traces

When we write a programme,we declare variables and compiler allocates memory to them.I want to get access to the physical block number of hard-disk where actually the data is stored by the programme " Some one help me out... (3 Replies)
Discussion started by: nagraz007
3 Replies
DISKTYPE(1)						    BSD General Commands Manual 					       DISKTYPE(1)

NAME
disktype -- disk format detector SYNOPSIS
disktype file... DESCRIPTION
The purpose of disktype is to detect the content format of a disk or disk image. It knows about common file systems, partition tables, and boot codes. USAGE
disktype can be run with any number of regular files or device special files as arguments. They will be analyzed in the order given, and the results printed to standard output. There are no switches in this version. Note that running disktype on device files like your hard disk will likely require root rights. See the online documentation at <http://disktype.sourceforge.net/doc/> for some example command lines. RECOGNIZED FORMATS
The following formats are recognized by this version of disktype. File systems: FAT12/FAT16/FAT32, NTFS, HPFS, MFS, HFS, HFS Plus, ISO9660, ext2/ext3, Minix, ReiserFS, Reiser4, Linux romfs, Linux cramfs, Linux squashfs, UFS (some variations), SysV FS (some variations), JFS, XFS, Amiga FS/FFS, BeOS BFS, QNX4 FS, UDF, 3DO CD-ROM file system, Veritas VxFS, Xbox DVD file system. Partitioning: DOS/PC style, Apple, Amiga "Rigid Disk", ATARI ST (AHDI3), BSD disklabel, Linux RAID physical disks, Linux LVM1 physical volumes, Linux LVM2 physical volumes, Solaris x86 disklabel (vtoc), Solaris SPARC disklabel. Other structures: Debian split floppy header, Linux swap. Disk images: Raw CD image (.bin), Virtual PC hard disk image, Apple UDIF disk image (limited). Boot codes: LILO, GRUB, SYSLINUX, ISOLINUX, Linux kernel, FreeBSD loader, Sega Dreamcast (?). Compression formats: gzip, compress, bzip2. Archive formats: tar, cpio, bar, dump/restore. Compressed files (gzip, compress, bzip2 formats) will also have their contents analyzed using transparent decompression. The appropriate com- pression program must be installed on the system, i.e. gzip(1) for the gzip and compress formats, bzip2(1) for the bzip2 format. Disk images in general will also have their contents analyzed using the proper mapping, with the exception of the Apple UDIF format. See the online documentation at <http://disktype.sourceforge.net/doc/> for more details on the supported formats and their quirks. HOMEPAGE
http://disktype.sourceforge.net/ AUTHOR
Christoph Pfisterer <chrisp@users.sourceforge.net> SEE ALSO
file(1), gpart(8) Feb 21, 2005
All times are GMT -4. The time now is 07:41 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy