Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Undeleting files....
Special Forums UNIX Desktop Questions & Answers Undeleting files.... Post 302073889 by Corona688 on Thursday 18th of May 2006 11:37:00 AM
Old 05-18-2006
Quote:
Originally Posted by devriest
The thing that I'm curious about though, is that if I'm able to overwrite my drive and they are still able to find something, not that I've got anything to hide, but if that's the case, then how is the drive able to store anything at all? It would seem to me that due to the drives being composed of basically the same thing as a video or cassette tape, that once it's been overwritten the data that was there simply no longer is. Maybe that's vastly oversimplified, but if the contents were still there, then when you tape 24 over with the Sopranos, you'd have Tony Soprano saving the nation.
Hard drives do a lot of signal processing for you that you aren't aware of, filtering noise and such. To use your hypothetical example, the hard drive would normally filter out 24 and just give you the Soprano's -- telling them apart is easy since the signals are digital, it can take the strong signal and TOTALLY ignore the weak one. But if that "noise" is what you're actually looking for, finding it is possible, given a great deal of effort and expensive custom hardware. It's certainly not easy. It's more like forensics.

Not to mention that VCR's aren't the same as hard drives. VCR's have a whole seperate head for erasing the tape before it's recorded on.

Just overwriting the file isn't guaranteed to even overwrite the same sectors, by the way. It depends on the way the filesystem works. For instance, Journaling Flash FileSystem -- JFFS -- is specifically designed to not use the same sectors over and over, so as to not prematurely wear out flash media.
Last edited by Corona688; 05-18-2006 at 12:44 PM..
 

9 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

How to retrieve all the linked script files/ctl files/sql files?

Hi I am going to migrate our datawarehouse system from HP Tru 64 Unix to the Red Hat Linux. Inside the box, it is running around 40 cron jobs; inside each cron job, it is calling other shell script files, and the shell script files may again call other shell script files or ctl files(for... (1 Reply)
Discussion started by: franksubramania
1 Replies

2. Shell Programming and Scripting

How to Pull out multiple files from DB table and redirect all those files to a differetn directory?

Hi everyone!! I have a database table, which has file_name as one of its fields. Example: File_ID File_Name Directory Size 0001 UNO_1232 /apps/opt 234 0002 UNO_1234 /apps/opt 788 0003 UNO_1235 /apps/opt 897 0004 UNO_1236 /apps/opt 568 I have to... (3 Replies)
Discussion started by: ss3944
3 Replies

3. Shell Programming and Scripting

How to extract data from indexed files (ISAM files) maintained in an unix server.

Hi, Could someone please assist on a quick way of How to extract data from indexed files (ISAM files) maintained in an UNIX(AIX) server.The file data needs to be extracted in flat text file or CSV or excel format . Usually we have programs in microfocus COBOL to extract data, but would like... (2 Replies)
Discussion started by: devina
2 Replies

4. UNIX for Dummies Questions & Answers

write a program in c in unix that display the files(includ sub-direc and files within) in a sorted

the sorting is based on name of file, file size modification time stamps o f file it should dislay the output in the following format "." and ".." enteries should be ignored please give some idea how to do it (1 Reply)
Discussion started by: pappu kumar jha
1 Replies

5. Shell Programming and Scripting

need a shell script to extract the files from source file and check whether those files existonserve

Hi, I am new to shell scripting.Please help me on this.I am using solaris 10 OS and shell i am using is # echo $0 -sh My requirement is i have source file say makefile.I need to extract files with extensions (.c |.cxx |.h |.hxx |.sc) from the makefile.after doing so i need to check whether... (13 Replies)
Discussion started by: muraliinfy04
13 Replies

6. Shell Programming and Scripting

How to create zip/gz/tar files for if the files are older than particular days in UNIX or Linux?

I need a script file for backup (zip or tar or gz) of old log files in our unix server (causing the space problem). Could you please help me to create the zip or gz files for each log files in current directory and sub-directories also? I found one command which is to create gz file for the... (4 Replies)
Discussion started by: Mallikgm
4 Replies

7. Shell Programming and Scripting

Append string to all the files inside a directory excluding subdirectories and .zip files

Hii, Could someone help me to append string to the starting of all the filenames inside a directory but it should exclude .zip files and subdirectories. Eg. file1: test1.log file2: test2.log file3 test.zip After running the script file1: string_test1.log file2: string_test2.log file3:... (4 Replies)
Discussion started by: Ravi Kishore
4 Replies

8. Shell Programming and Scripting

Shell script for field wise record count for different Files .csv files

Hi, Very good wishes to all! Please help to provide the shell script for generating the record counts in filed wise from the .csv file My question: Source file: Field1 Field2 Field3 abc 12f sLm 1234 hjd 12d Hyd 34 Chn My target file should generate the .csv file with the... (14 Replies)
Discussion started by: Kirands
14 Replies

9. UNIX for Beginners Questions & Answers

Automate splitting of files , scp files as each split completes and combine files on target server

i use the split command to split a one terabyte backup file into 10 chunks of 100 GB each. The files are split one after the other. While the files is being split, I will like to scp the files one after the other as soon as the previous one completes, from server A to Server B. Then on server B ,... (2 Replies)
Discussion started by: malaika
2 Replies

LEARN ABOUT XFREE86

asadmin-delete-domain

asadmin-delete-domain(1AS)					   User Commands					asadmin-delete-domain(1AS)

NAME

       asadmin-delete-domain, delete-domain - deletes the givendomain

SYNOPSIS

       delete-domain [--terse=false] [--echo=false] [--domaindir install_dir/domains] domain_name

       delete-domain  deletes  the  specified  domain.	The domain must already exist and must be stopped. This command is supported in local mode
       only.

OPTIONS

       --domaindir	       directory where the domain is to be deleted. If specified, path must be accessible in the filesystem. If not speci-
			       fied, the domain in the default install_dir/domains directory is deleted.

       --terse		       indicates that any output data must be very concise, typically avoiding human-friendly sentences and favoring well-
			       formatted data for consumption by a script. Default is false.

       --echo		       setting to true will echo the command line statement on the standard output. Default is false.

OPERANDS

       domain_name	       name of the domain. Must be a unique name.

       Example 1: Using delete-domain

       asadmin> delete-domain sampleDomain
       deleted domain sampleDomain successfully

       Where: the sampleDomain domain is deleted.

EXIT STATUS

       0		       command executed successfully

       1		       error in executing the command

       asadmin-create-domain(1AS), asadmin-start-domain(1AS), asadmin-stop-domain(1AS), asadmin-list-domains(1AS)

J2EE 1.4 SDK							    March 2004						asadmin-delete-domain(1AS)
All times are GMT -4. The time now is 10:16 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy