±Forensic Focus Partners

Become an advertising partner

±Your Account


Username
Password

Forgotten password/username?

Site Members:

New Today: 3 Overall: 36017
New Yesterday: 10 Visitors: 105

±Follow Forensic Focus

Forensic Focus Facebook PageForensic Focus on TwitterForensic Focus LinkedIn GroupForensic Focus YouTube Channel

RSS feeds: News Forums Articles

±Latest Articles

±Latest Videos

±Latest Jobs

is this absurd or logic way to erase Flash memory?

Computer forensics discussion. Please ensure that your post is not better suited to one of the forums below (if it is, please post it there instead!)
Reply to topicReply to topic Printer Friendly Page
Forum FAQSearchView unanswered posts
Page 1, 2, 3  Next 
  

williamsonn
Senior Member
 

is this absurd or logic way to erase Flash memory?

Post Posted: Feb 09, 13 03:17

hello

I am thinking about this issue:

If any eraser software what makes is to overwrite the drive with random data, and only a pass is needed to delete any previous stored data, then, would also be similarly effective for wiping, erasing a mp3 player [u]using its voice recording option and filling the device with environment blank noise, or music?  
 
  

Beetle
Senior Member
 

Re: is this absurd or logic way to erase Flash memory?

Post Posted: Feb 09, 13 05:36

- williamsonn
hello

I am thinking about this issue:

If any eraser software what makes is to overwrite the drive with random data, and only a pass is needed to delete any previous stored data, then, would also be similarly effective for wiping, erasing a mp3 player [u]using its voice recording option and filling the device with environment blank noise, or music?


Why would you think it would be any different? The active data would be gone but the file system would be intact, I think this has been covered in other threads.

We used to just write one big random file over areas of drives we wanted to sanitize.  
 
  

ThePM
Senior Member
 

Re: is this absurd or logic way to erase Flash memory?

Post Posted: Feb 09, 13 07:53

Depends if your mp3 player is using HDD or Flash memory.

Flash memory is a bit different than HDDs as most Flash devices have more memory than advertised to be able to do wear levelling. This memory is not user accessible and is used solely by the Flash controller for the wear levelling tasks. During wear leveling, data can be copied and moved around everywhere on the Flash chips.

So, if you do a standard wipe that does 1-pass overwrite on a Flash drive, you might write on the user accessible memory, but not on the system reserved memory used for wear leveling, leaving potentially chunks of data that could be retrieved via JTAG or chip-off.

For example, a 120 GB SSD drive might in fact have 160 GB of Flash memory, but only 120 GB that is user accessible. So, if you do a standard wipe, you might end up wiping some 120 GB, potentially leaving 40 GB of chunks of data.

NIST suggests to wipe Flash and SSD drives with the ATA Secure Erase command, which self-erases all Flash chips on the drive, including system reserved ones. Of course, this works if the manufacturer has implemented the Secure Erase command correctly...  
 
  

williamsonn
Senior Member
 

Re: is this absurd or logic way to erase Flash memory?

Post Posted: Feb 10, 13 01:08

then, is there any easy way(for non experts) to 100% delete an used flash memory before selling it?, if not, the only way would be to destroy the chips, and of course, the pendrive/mp3 player couldn´t be sold.  
 
  

williamsonn
Senior Member
 

Re: is this absurd or logic way to erase Flash memory?

Post Posted: Feb 10, 13 01:10

- williamsonn
then, is there any easy way(for non experts) to 100% delete an used flash memory before selling it?, if not, the only way would be to destroy the chips, and of course, the pendrive/mp3 player couldn´t be sold.


Question For example: would a full windows format reach all the flash memory levels?  
 
  

williamsonn
Senior Member
 

Re: is this absurd or logic way to erase Flash memory?

Post Posted: Feb 10, 13 01:15

IS this article correct?

www.wipeyourdata.com/s...umb-drive/  
 
  

jaclaz
Senior Member
 

Re: is this absurd or logic way to erase Flash memory?

Post Posted: Feb 10, 13 01:15

- williamsonn


Question For example: would a full windows format reach all the flash memory levels?


No.

jaclaz
_________________
- In theory there is no difference between theory and practice, but in practice there is. - 
 

Page 1 of 3
Page 1, 2, 3  Next