"R.S." <[EMAIL PROTECTED]> wrote in message news:<[EMAIL PROTECTED]>... > (IBM Mainframe Discussion List) wrote: > > > > > > In a message dated 2/7/2008 12:27:49 A.M. Central Standard Time, > > [EMAIL PROTECTED] writes: > >> I believe someone on here said that the DOD said 15 writes over the
> > data set was good enough. > > > > The latest (JUN 2001) DOD specification that I read on the Internet said six > > times is enough, but you have to write certain bit patterns. The German DOD > > wants seven times. > > Gentlemen, > Don't you think, the "magic numbers" of the rewrites comes from voodoo > (or black magic) rather than from technological reasons ? > Any disk taken (stolen) from DASD array contains part of > gazillion-elements-puzzle. Without any overwrite. If you overwrite the > data, the only method to (try to) find the previous content is to use > microscope and watch magnetic domains. Try to find out what was the > previous value. More than gazillion-element-puzzle. After that, you > still have the previous excercise, that means set up array from > "independent" disks. > IMHO it is much easier and cheaper to pay someone for the data. > > BTW: I would like to see *technical* justification of "15-times" or any > other number. Technical one, not "because mama said so". > > -- > Radoslaw Skorupka I also had my thoughts about the this theory to find back old data. We once had an issue with overwritten tapes and asked a company specialized in recovering data from damaged media for our options and they simply said it was impossible to recover overwritten data. Kees. ********************************************************************** For information, services and offers, please visit our web site: http://www.klm.com. This e-mail and any attachment may contain confidential and privileged material intended for the addressee only. If you are not the addressee, you are notified that no part of the e-mail or any attachment may be disclosed, copied or distributed, and that any other action related to this e-mail or attachment is strictly prohibited, and may be unlawful. If you have received this e-mail by error, please notify the sender immediately by return e-mail, and delete this message. Koninklijke Luchtvaart Maatschappij NV (KLM), its subsidiaries and/or its employees shall not be liable for the incorrect or incomplete transmission of this e-mail or any attachments, nor responsible for any delay in receipt. Koninklijke Luchtvaart Maatschappij N.V. (also known as KLM Royal Dutch Airlines) is registered in Amstelveen, The Netherlands, with registered number 33014286 ********************************************************************** ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
