If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
|
Thread Tools | Display Modes |
#11
|
|||
|
|||
Forensic Files email reply
On Wed, 19 Aug 2009 15:22:08 -0700 (PDT), Joshua Snodgrass
wrote: : On Aug 2, 6:44*pm, David Nebenzahl wrote: : On 8/2/2009 5:58 AM Robert Coe spake thus: : : If you want to irretrievably destroy the data on a CD, scrape the : coating off of the "back" side; that's where the information is. The : reader looks through a layer of clear plastic, which effectively : protects the data from damage to the front side. That's why scratches : on the front side usually don't have much of an effect. And why users : *should be more careful not to damage the back side than they usually : are. : : Or so I've been told by those who know more about CDs than I do. : : Take it from someone who used to work with CDs; you've got it pretty : much correct. : : Actually, you don't even need to scratch off much of the coating to make : a CD unreadable and the data unrecoverable; a few well-placed scratches, : especially concentric with the disc, will do the job. That's because : you're destroying most of the data in each track. (This is why users are : advised to clean CDs only by wiping radially--from the center of the : disc towards the edge--rather than circularly; any damage done this way : will be distributed over different tracks, which reduces the risk of : unrecoverable read errors.) : : BTW, I'm not sure that DVDs work entirely the same way. : : Basically the same way, though as someone else pointed out, DVDs have : multiple layers. Still read from the "bottom" of the disc. : : -- : Found--the gene that causes belief in genetic determinism : : Just so everyone knows, Julie Snodgrass was my mother. Joe Snodgrass : is my father. I am their son. If you guys want real answers about : this feel free to ask me. . My name is Joshua : Snodgrass. No offense intended, but is that factoid germane to this discussion in some way? This isn't a genealogy newsgroup. Bob |
|
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Why do we reply to RichA? | Padu | Digital SLR Cameras | 16 | October 29th 06 01:06 PM |
Digital photos for forensic evidence | Alfred Molon | Digital Photography | 65 | January 30th 06 11:22 PM |
Reply to "Dan" about processor | John Costello | Darkroom Equipment For Sale | 0 | December 6th 04 08:20 PM |
Forensic Digital Photo Seminar ? | Ronda T. | Digital Photography | 2 | November 3rd 04 07:19 AM |
Photo Shop 7 training, for details reply by email. | Learn Photo Shop 7 | Digital Photo Equipment For Sale | 0 | October 1st 03 12:51 PM |