Selling my Desire...ensuring all data is wiped?

[.ParanoidAndroid.]

Calm down, calm down. I'm only selling it because I'm upgrading the HD.

Alright, phew.
Anyway.

Obviously as I'm selling it, I want to be certain that it is at factory default. Now I know there's a "reset to factory" option, but previous phones I've had that often only just dealt with setting and left files or other data on the phone. They were essentially "soft resets".
I also obviously want to completely disassociate any logins with this phone.

So! Is there a way to do this, to completely wipe it clean?
Thanks!

 

[StevenSeed]

Factory reset should completely wipe it clean.

 

[EddyOS]

Obviously format the SD card as well if you're including it in the sale (and backup anything you want to keep before doing it!!)

 

[patpending]

No real way to wipe it in it's entirety ... All phones these days, even if you delete all or perform a factory reset, will store ALL user data in hidden .zip files on both the internal drive and SD card. The only time these files are 'removed' is when storage is at maximum capacity, and 'overwrite' themselves.

I only know this having dealt with the E-Crime department recently....

Having said that, it takes more than just your 'average purchaser' to gain access to these hidden storage files

 

[DesireMe]

How much do you reckon you can get for it?