I am trying to view multi. session of hda like cdrom.


root@localhost ~]# fdisk -l

Disk /dev/hda: 80.0 GB, 80060424192 bytes
255 heads, 63 sectors/track, 9733 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/hda1 * 1 1305 10482381 c W95 FAT32 (LBA)
/dev/hda2 1306 2610 10482412+ 83 Linux
/dev/hda3 2611 9733 57215497+ 5 Extended
/dev/hda5 2611 2740 1044193+ 82 Linux swap / Solaris
/dev/hda6 * 2741 5350 20964793+ 83 Linux
/dev/hda7 5351 7960 20964793+ b W95 FAT32
/dev/hda8 7961 9733 14241591 b W95 FAT32
[root@localhost ~]# cdrecord -toc dev=/dev/hda6
Cdrecord-Clone 2.01-dvd (i686-pc-linux-gnu) Copyright (C) 1995-2004 Jörg Schilling
Note: This version is an unofficial (modified) version with DVD support
Note: and therefore may have bugs that are not present in the original.
Note: Please send bug reports or support requests to http://bugzilla.redhat.com/bugzilla
Note: The author of cdrecord should not be bothered with problems in this version.
scsidev: '/dev/hda6'
devname: '/dev/hda6'
scsibus: -2 target: -2 lun: -2
Error trying to open /dev/hda6 exclusively ... retrying in 1 second.
Error trying to open /dev/hda6 exclusively ... retrying in 1 second.
Error trying to open /dev/hda6 exclusively ... retrying in 1 second.

[root@localhost ~]#

Am i wrong ?

Your question is unclear---are you trying to record a cd? If so, the syntax looks suspicious. What is "dev=/dev/hda6" supposed to do as part of the cdrecord command?jpg file format specification.
The way I read man cdrecord is that dev= wants to be followed by the target cd recording device.

Actually i am trying to get a multisession info of harddisk,exactly what you will do for cdrom's.The block device given is harddisk which is also a set of cd-blocks you know?Or it is crazy.

What is a "multisession info of harddisk" ?

IDE/ATA hard drives do not use the same format as CD-ROMS.
I have never seen "multi-session" used in relation to hard drives.

Your original post shows an attempt to use cdrecord to write to a hard drive---makes no sense.

Well, not completely non sense.
Nothing prevent someone to write an ext2fs or whatever filesystem on a CD, or to write an iso9660 on a disk partition, although you will have some limitations, for example on disk size with iso9660.
The cd recording tools relies on the underlying device to be a real cd drive, and send specific commands unknown to a disk drive, thus its confusion.