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thanks for the replies. well "Tinkster" as you mentioned that
You find the device node for your DVD writer; check your logs
and/or the output of 'dmesg'.
Can I say that "Device node" is is the name of my dvd writer which linux using using.These can be check by logs and 'dmesg' ?
I shall try to elaborate by example:
dmesg | grep -C5 DVD
Initializing USB Mass Storage driver...
ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
usbcore: registered new interface driver usb-storage
ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
USB Mass Storage support registered.
ata2.00: ATAPI: MATSHITADVD-RAM UJ862A, SB15, max UDMA/33
usbcore: registered new interface driver ums-alauda
usbcore: registered new interface driver ums-cypress
ata2.00: configured for UDMA/33
usbcore: registered new interface driver ums-datafab
usbcore: registered new interface driver ums-freecom
sd 0:0:0:0: [sda] 312581808 512-byte logical blocks: (160 GB/149 GiB)
sd 0:0:0:0: [sda] Write Protect is off
sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
usbcore: registered new interface driver ums-usbat
scsi 1:0:0:0: CD-ROM MATSHITA DVD-RAM UJ862A SB15 PQ: 0 ANSI: 5
PNP: PS/2 Controller [PNP0303:KBD,PNP0f13:MOU] at 0x60,0x64 irq 1,12
sda:sr0: scsi3-mmc drive: 24x/24x writer dvd-ram cd/rw xa/form2 cdda tray
usb 1-5: New USB device found, idVendor=04b3, idProduct=4485
usb 1-5: New USB device strings: Mfr=0, Product=0, SerialNumber=0
serio: i8042 KBD port at 0x60,0x64 irq 1
On my machine the bit in RED is the device node I'd have
to use instead of /dev/cdrom ... so, /dev/sr0 (of course, udev for you may
create a symlink to e.g. /dev/dvdwriter ...
Originally Posted by gardenair
Because Linux has access to the raw device. That's why dd is
using the device node in the first place, rather than a mountpoint
I can not understand by raw device? Should be thankfull if u you explain it in more detail.
Raw device, as opposed to e.g. a file-system. Looking at a hard-drive
linux will give you (in most cases) 2 (or more) device nodes, e.g.
The first being the HDD in its entirety. The second being the first
partition. Those are "raw devices", in other words, looking at those
in a hex editor won't give you very useful information. To make use
of the content in a human-parsable form you want to mount the device
node for a partition using the file-system that is on it.
If that doesn't do it for you I suggest you download e.g. the RUTE
guide to Linux.