163 GB data at 4.7 GB DVD

[ramakanta]

I was shocked when want to copy of movies Oh My God! in my computer that recently purchased - there is not enough space on Disk. when i was see inside there is DVD data contains 163GB . all the screen shot avail(below).





Is it possible 163GB of data can store in 4.7 GB of DVD . please any one help me how it possible outside memory 4.37 GB and inside 163GB . i am confused.
Thank you

[nuttzo31]

That's some kind of copy protection on the disk where it is padded out with dummy files.

[ramakanta]

That's some kind of copy protection on the disk where it is padded out with dummy files.

is it possible ?? if , then How.??

[pompel9]

No it is not possible.

As the one above you said, there are copy-protection on the DVD so your system can't read it right.

[nuttzo31]

There's not actually 163gb of data on the dvd the files are just filled with 0's or something like that.

[ramakanta]

No it is not possible.

As the one above you said, there are copy-protection on the DVD so your system can't read it right.

i have tested all .vob file . all are playing ok .

VTS_01_1.vob, VTS_01_2.vob ...... VTS_01_5.vob contain movie

also VTS_02_1.vob to VTS_02_5 .vob contain same movie and playing ok

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VTS_39_1.vob to VTS_39_5 .vob also contain same movie and playing ok


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[Wim Sturkenboom]

Read up on sparse files

Step 1
Check diskspace before creating a 1GB file

wim@i3-2120:/mnt$ du --max-depth=1
32	./boot-sav
219602196	./photos
219602232	.
wim@i3-2120:/mnt$ df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda5       138G  4,9G  126G   4% /
udev            3,7G  4,0K  3,7G   1% /dev
tmpfs           1,5G  856K  1,5G   1% /run
none            5,0M     0  5,0M   0% /run/lock
none            3,7G  216K  3,7G   1% /run/shm
/dev/sda6       532G   14G  491G   3% /home
/dev/sdc1       925G  210G  706G  23% /mnt/photos

Step 2
Create a 1GB file

wim@i3-2120:/mnt$ cd photos/wim/
wim@i3-2120:/mnt/photos/wim$ dd if=/dev/null of=sparse-file bs=1k seek=1000000 count=1
0+0 records in
0+0 records out
0 bytes (0 B) copied, 2,112e-05 s, 0,0 kB/s
wim@i3-2120:/mnt/photos/wim$ ls -l
total 33016
-rwxr-xr-x 1 wim wim    6068196 Jan 11  2011 IMGP2310 (copy).jpg
-rwxr-xr-x 1 wim wim   10801944 Jan 11  2011 IMGP2310 (copy).PEF
-rwxr-xr-x 1 wim wim    6068196 Jan 11  2011 IMGP2310.jpg
-rwxr-xr-x 1 wim wim   10801944 Jan 11  2011 IMGP2310.PEF
-rw-rw-r-- 1 wim wim 1024000000 Nov 30 16:05 sparse-file

Step 3
Check available diskspace after creating 1GB file

wim@i3-2120:/mnt/photos/wim$ du --max-depth=1 /mnt
32	/mnt/boot-sav
219602196	/mnt/photos
219602232	/mnt
wim@i3-2120:/mnt/photos/wim$ df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda5       138G  4,9G  126G   4% /
udev            3,7G  4,0K  3,7G   1% /dev
tmpfs           1,5G  856K  1,5G   1% /run
none            5,0M     0  5,0M   0% /run/lock
none            3,7G  216K  3,7G   1% /run/shm
/dev/sda6       532G   14G  491G   3% /home
/dev/sdc1       925G  210G  706G  23% /mnt/photos

Note that the disk usage / free space did not change

[dcottingham]

That screen shot appears to be from Windows, not Ubuntu. Am I missing something?

[Wim Sturkenboom]

is it possible ?? if , then How.??

Yes, it is possible

No it is not possible.

As proven above, it is possible to create a file that does not take space but is reported as 1GB.

You can writes a utility that copies a normal file, next seeks behind the end of the copied data, write some more bytes and close the file.

[ramakanta]

Read up on sparse files

Step 1
Check diskspace before creating a 1GB file

wim@i3-2120:/mnt$ du --max-depth=1
32    ./boot-sav
219602196    ./photos
219602232    .
wim@i3-2120:/mnt$ df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda5       138G  4,9G  126G   4% /
udev            3,7G  4,0K  3,7G   1% /dev
tmpfs           1,5G  856K  1,5G   1% /run
none            5,0M     0  5,0M   0% /run/lock
none            3,7G  216K  3,7G   1% /run/shm
/dev/sda6       532G   14G  491G   3% /home
/dev/sdc1       925G  210G  706G  23% /mnt/photos

Step 2
Create a 1GB file

wim@i3-2120:/mnt$ cd photos/wim/
wim@i3-2120:/mnt/photos/wim$ dd if=/dev/null of=sparse-file bs=1k seek=1000000 count=1
0+0 records in
0+0 records out
0 bytes (0 B) copied, 2,112e-05 s, 0,0 kB/s
wim@i3-2120:/mnt/photos/wim$ ls -l
total 33016
-rwxr-xr-x 1 wim wim    6068196 Jan 11  2011 IMGP2310 (copy).jpg
-rwxr-xr-x 1 wim wim   10801944 Jan 11  2011 IMGP2310 (copy).PEF
-rwxr-xr-x 1 wim wim    6068196 Jan 11  2011 IMGP2310.jpg
-rwxr-xr-x 1 wim wim   10801944 Jan 11  2011 IMGP2310.PEF
-rw-rw-r-- 1 wim wim 1024000000 Nov 30 16:05 sparse-file

Step 3
Check available diskspace after creating 1GB file

wim@i3-2120:/mnt/photos/wim$ du --max-depth=1 /mnt
32    /mnt/boot-sav
219602196    /mnt/photos
219602232    /mnt
wim@i3-2120:/mnt/photos/wim$ df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda5       138G  4,9G  126G   4% /
udev            3,7G  4,0K  3,7G   1% /dev
tmpfs           1,5G  856K  1,5G   1% /run
none            5,0M     0  5,0M   0% /run/lock
none            3,7G  216K  3,7G   1% /run/shm
/dev/sda6       532G   14G  491G   3% /home
/dev/sdc1       925G  210G  706G  23% /mnt/photos

Note that the disk usage / free space did not change

what does it mean . please explain with details . i am not export in programme.
thank you.