[Date Prev][Date Next] [Thread Prev][Thread Next] [Date Index] [Thread Index]

Re: Blanking/Formating a BD-RE

The thing I want to get is the following: I need to get the difference between a written bd-re (containing toc/filesytem/data/..) and an "empty" one. But here my problem starts. When I do a dvd+rw-mediainfo on a media which was formatted (after it was written with an iso) with dvd+rw- format I get the following info: 

[root@smooth /]# dvd+rw-mediainfo /dev/hdb
INQUIRY:                [Optiarc ][BDRW BD-M100A   ][1.0e]
GET [CURRENT] CONFIGURATION:
 Mounted Media:         43h, BD-RE
 Media ID:                SONY/ES1
 Current Write Speed:   2.0x4495=8991KB/s
 Write Speed #0:        2.0x4495=8991KB/s
Speed Descriptor#0: 01/11826175 R@2.0x4495=8991KB/s W@2.0x4495=8991KB/s 
BD SPARE AREA INFORMATION:
 Spare Area:            393216/393216=100.0% free
READ DISC INFORMATION:
 Disc status:           complete
 Number of Sessions:    1
 State of Last Session: complete
 Number of Tracks:      1
READ FORMAT CAPACITIES:
 formatted:		11826176*2048=24220008448
 00h(3000):		11826176*2048=24220008448
 01h(800):		11564032*2048=23683137536
 30h(3000):		11826176*2048=24220008448
 30h(5000):		11564032*2048=23683137536
 30h(1000):		12088320*2048=24756879360
 31h(800):		12219392*2048=25025314816
READ TRACK INFORMATION[#1]:
 Track State:           complete
 Track Start Address:   0*2KB
 Free Blocks:           0*2KB
 Track Size:            11826176*2KB
FABRICATED TOC:
 Track#1  :             14@0
 Track#AA :             14@11826176
 Multi-session Info:    #1@0
READ CAPACITY:          11826176*2048=24220008448


Compared with a new one (fresh from the box):

[root@smooth ~]# dvd+rw-mediainfo /dev/hdb
INQUIRY:                [Optiarc ][BDRW BD-M100A   ][1.0e]
GET [CURRENT] CONFIGURATION:
 Mounted Media:         43h, BD-RE
 Media ID:                SONY/ES1
 Current Write Speed:   2.0x4495=8991KB/s
 Write Speed #0:        2.0x4495=8991KB/s
Speed Descriptor#0: 01/12219391 R@2.0x4495=8991KB/s W@2.0x4495=8991KB/s 
READ DISC INFORMATION:
 Disc status:           blank
 Number of Sessions:    1
 State of Last Session: empty
 "Next" Track:          1
 Number of Tracks:      1
READ FORMAT CAPACITIES:
 unformatted:		12219392*2048=25025314816
 00h(3000):		11826176*2048=24220008448
 01h(800):		11564032*2048=23683137536
 30h(3000):		11826176*2048=24220008448
 30h(5000):		11564032*2048=23683137536
 30h(1000):		12088320*2048=24756879360
 31h(800):		12219392*2048=25025314816
READ TRACK INFORMATION[#1]:
 Track State:           blank
 Track Start Address:   0*2KB
 Free Blocks:           0*2KB
 Track Size:            0*2KB
Here you can see the difference: in the first output even when I format the disc with dvd+rw-format it says "completed" and that it has a TOC. 
On the "fresh" media it says blank which is perfect for me.
Anyone has an idea how to know from the dvd+rw-mediainfo output if it is really blank or if it contains data ? 

yours

Arnold



Am 05.03.2008 um 14:20 schrieb Andy Polyakov:
If someone can provide me some tool or instructions how to do it I could try it on another PC with BD-RE drive.
If the only goal is to render media unmountable, then, as Thomas suggested, you should find a way to nullify beginning of media. One way is to 'dd if=/dev/zero bs=1k count=64 | growisofs -Z /dev/cdrom=/ dev/fd/0'. If you ought to nullify the whole thing, e.g. for privacy reasons, then 'growisofs -Z /dev/cdrom=/dev/zero' would do. However!!! As it's time consuming procedure it's probably more appropriate to spend this time on 'dvd+rw-format -format=full /dev/ cdrom', because it will also verify media for eventual defects. On the other hand if current data-set is much less than media capacity and you want to nullify only this data, you can save time by figuring out how large is the data-set and adjusting count in above mentioned dd command accordingly. For example take "1k-blocks" value from 'df -k /mnt/cdrom' output and feed it as count to dd. A.
Reply to: