DVD & Home Theater Gear Discuss DVD and Home Theater Equipment.

Formatting a disc did not erase it

Old 09-07-06, 09:09 AM
  #1  
New Member
Thread Starter
 
Join Date: Sep 2006
Posts: 3
Formatting a disc did not erase it

I had a DVD with a Jimi Hendrix concert and a Deep Purple concert on it. I decided to format the disc thereby erasing that stuff and using the disc again to record a guitar video which I recently bought. After I was done recording the guitar video I watched it and after the video was over you could see the Deep Purple video. So when I formatted the disc all of it's contents were not erased.

I thought that when you format a disc you are totally erasing it's contents. But here for some reason it didn't work that way. I'm using Sony DVD-RW discs and a Sony DVD Recorder.
357mag is offline  
Old 09-07-06, 09:20 AM
  #2  
DVD Talk Legend
 
Join Date: Jun 1999
Location: USA
Posts: 12,249
Formatting does nothing but flag the content as data that can be erased. If you want to erase it would would need to record some data over it. Always been this way with any type of recordable media.
Brian Shannon is offline  
Old 09-07-06, 10:30 PM
  #3  
New Member
Thread Starter
 
Join Date: Sep 2006
Posts: 3
If that's true then the manufacturers of these DVD recorders(mine is a Sony) should not show you an on screen message saying that if you format all data will be erased. That's quite deceiving. It's too bad though that there is not a way to simply blank out the disc other than recording new stuff on top of the old stuff.
357mag is offline  
Old 09-07-06, 11:10 PM
  #4  
DVD Talk Platinum Edition
 
JZ1276's Avatar
 
Join Date: Aug 2004
Location: Long Island
Posts: 3,599
Originally Posted by 357mag
If that's true then the manufacturers of these DVD recorders(mine is a Sony) should not show you an on screen message saying that if you format all data will be erased. That's quite deceiving. It's too bad though that there is not a way to simply blank out the disc other than recording new stuff on top of the old stuff.
There is a way to blank out the disc ... delete all titles on it
JZ1276 is offline  
Old 09-08-06, 01:34 AM
  #5  
New Member
Thread Starter
 
Join Date: Sep 2006
Posts: 3
I'll have to look in my owner's manual and hopefully they will give instructions on how to do that.
357mag is offline  
Old 09-08-06, 11:04 AM
  #6  
DVD Talk Limited Edition
 
Join Date: Mar 2002
Location: Mpls, MN
Posts: 6,831
Originally Posted by 357mag
If that's true then the manufacturers of these DVD recorders(mine is a Sony) should not show you an on screen message saying that if you format all data will be erased. That's quite deceiving. It's too bad though that there is not a way to simply blank out the disc other than recording new stuff on top of the old stuff.
No offense, man. But this has been the issue for over 20 years on every sort of computer disc. Sorry you didn't know, yet. Now you do! Even overwriting the data doesn't always completely erase a disc. That's why the "safe" overwriting systems write over many times, not just once....4 is a common number of overwrites. If you really want an optical disc to be secure and deleted, break it in half and use a new one for new data.
Spiky is offline  
Old 09-08-06, 11:08 AM
  #7  
DVD Talk Limited Edition
 
Join Date: Mar 2002
Location: Mpls, MN
Posts: 6,831
Originally Posted by JZ1276
There is a way to blank out the disc ... delete all titles on it
I believe this will have the same effect as a quick format. A security/detective program that will simply read bits off the disc will still find the data, even if there is no disc structure to help. Overwriting is the only true way to delete computer discs. Or make them unreadable through physical damage, not a good choice for a $200 hard drive, maybe for a $.25 DVD.
Spiky is offline  
Old 09-08-06, 01:57 PM
  #8  
DVD Talk Legend
 
Mordred's Avatar
 
Join Date: Jan 2000
Location: Austin, TX
Posts: 12,214
Originally Posted by 357mag
I had a DVD with a Jimi Hendrix concert and a Deep Purple concert on it. I decided to format the disc thereby erasing that stuff and using the disc again to record a guitar video which I recently bought. After I was done recording the guitar video I watched it and after the video was over you could see the Deep Purple video. So when I formatted the disc all of it's contents were not erased.
I would say that normally this is not the case. I've burned and formatted and burned DVD-RWs over and over again, and never noticed bleed through from the previous title. I'm not even sure how that would work unless somehow the VTS title stopped and there was another VOB file with the next number in the series visible, but even then, I wouldn't expect the DVD player to be able to see it because the pointer to that old file should have been erased (all formatting does is clear the Table of Contents) when the TOC was read.

Were you burning ISOs or a VIDEO_TS folder? Assuming it was the VIDEO_TS are you positive you didn't mix in some old VTS_XX_X.VOBs from the Deep Purple concert in with your guitar video? That seems to me to be a much more likely scenario.
Mordred is offline  
Old 09-08-06, 02:52 PM
  #9  
DVD Talk Limited Edition
 
Join Date: Mar 2002
Location: Mpls, MN
Posts: 6,831
Hey, I wasn't even thinking about that aspect. This must be either a DVD-RAM or a DVD+RW, since those formats can do partial deletes. That is just how those 2 formats work. The Deep Purple wasn't erased, only Jimi. DVD-RW can only be deleted "whole disc" at a time.
Spiky is offline  
Old 09-08-06, 06:12 PM
  #10  
DVD Talk Special Edition
 
Join Date: Mar 2005
Location: Trencher's Farm
Posts: 1,989
Dude, you shouldn't be deleting Jimi anyway.
mike7162 is offline  
Old 09-11-06, 04:57 PM
  #11  
DVD Talk Legend
 
Mordred's Avatar
 
Join Date: Jan 2000
Location: Austin, TX
Posts: 12,214
Originally Posted by Spiky
Hey, I wasn't even thinking about that aspect. This must be either a DVD-RAM or a DVD+RW, since those formats can do partial deletes. That is just how those 2 formats work. The Deep Purple wasn't erased, only Jimi. DVD-RW can only be deleted "whole disc" at a time.
That makes a lot more sense, I hadn't thought about the partial delete idea.
Mordred is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread

Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.