Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.




16 posts

Geek


# 175032 15-Jun-2015 10:41
Send private message


Hello guys!

 

I know many people asked this same question over and over but novice like me don't even know how to search answer in our great forum.

 

Can anyone tell me how to completely wipe internal storage so I can sell my old phone with peace of mind?

 

Do I need to get aftermarket program to root?

 

Thanks in advance!!

Create new topic
5453 posts

Uber Geek
+1 received by user: 1904


  # 1324830 15-Jun-2015 10:47
Send private message

To search the forum, you type words relating to what you want to find in to the "search" box at the top right of the page. Perhaps try searching for "erase phone" or "erase android"or something similar.

1528 posts

Uber Geek
+1 received by user: 544

Trusted

  # 1324833 15-Jun-2015 10:53

Encrypt it, then re-flash the stock ROM with ODIN. Or wipe just data from recovery mode after encrypting the device if you haven't had experience with ROM flashing or the ODIN tool before.




Product Manager @ PB Tech

https://pbtech.co.nz/smartphones


 
 
 
 


369 posts

Ultimate Geek
+1 received by user: 207

Lifetime subscriber

  # 1324965 15-Jun-2015 13:34
2 people support this post
Send private message

You can't, or not to a 100% reliable standard anyway.

All flash memory is over-provisioned: i.e. is says <X> GB 'on the tin', but there's actually <X + a bit> GB actually there and 'a bit' is a number proportional to the quality, sometimes up to 100%.
This is because flash memory is wear-limited, you can only write to each cell so many times beore it fails. In order to make sure you dn't see a failure before the expected life, the flash memory controller implements 'wear levelling', so when you re-write a block, the original is marked as 'available' and the information is written to a pseudao-random different physical place on the flash chip(s).
Note I said the flash memory controller, this is waay below what the Operating System can see, let alone an app. As user, you have absolutely no access to or control over this mechanism.

So, no matter how many time you 'erase' or 'over-write' data in flash memory, some or all of it may be recoverable by a sufficiently determined opponent.

The only way to avoid this would be to encrypt everything all the time from very first to very last use of the phone, using rock-solid encryption (AES-256 might be good enough) and an unguessable and very long key phrase - the longer the better, "Password1" is obviously broken, but "This is My passw0rd, and I don't think ya'll c4n guess it in a meeeelion years" is probably getting close wink.
However today's reports that Snowden's raw data treasure trove has been decrypted by the Russian and/or Chinese governments shows the outer limit of this approach

Hence, it's a matter of probability: If your data is so interesting that you're trying to keep it out of the hands of a well-resourced technically astute opponent, then just toss the phone in the crucible of a nice hot (e.g. 1500 degrees Celsius) furnace. Problem solved. If on the other hand, you're one of the 99.9% whose most 'interesting' data is maybe a selfie taken in a reduced-clothing state, or a drunken text message that you now deeply regret, then following NikT's excellent advice to encrypt all your data, then factory-reset the device, is most likely 'good enough'

Create new topic



Twitter and LinkedIn »



Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





News »

Xero announces new smarter tools, push into the North American market
Posted 19-Jun-2019 17:20


New report by Unisys shows New Zealanders want action by social platform companies and police to monitor social media sites
Posted 19-Jun-2019 17:09


ASB adds Google Pay option to contactless payments
Posted 19-Jun-2019 17:05


New Zealand PC Market declines on the back of high channel inventory, IDC reports
Posted 18-Jun-2019 17:35


Air New Zealand uses drones to inspect aircraft
Posted 17-Jun-2019 15:39


TCL Electronics launches its first-ever 8K TV
Posted 17-Jun-2019 15:18


E-scooter share scheme launches in Wellington
Posted 17-Jun-2019 12:34


Anyone can broadcast with Kordia Pop Up TV
Posted 13-Jun-2019 10:51


Volvo and Uber present production vehicle ready for self-driving
Posted 13-Jun-2019 10:47


100,000 customers connected to fibre broadband network through Enable
Posted 13-Jun-2019 10:35


5G uptake even faster than expected
Posted 12-Jun-2019 10:01


Xbox showcases 60 anticipated games
Posted 10-Jun-2019 20:24


Trend Micro Turns Public Hotspots into Secure Networks with WiFi Protection for Mobile Devices
Posted 5-Jun-2019 13:24


Bold UK spinoff for beauty software company Flossie
Posted 2-Jun-2019 14:10


Amazon Introduces Echo Show 5
Posted 1-Jun-2019 15:32



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.


Support Geekzone »

Our community of supporters help make Geekzone possible. Click the button below to join them.

Support Geezone on PressPatron



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.