Etch the coating off a 4GB pendrive?
Conundrum, Tue Apr 01 2008, 08:01PMHi all.
The engineer in me would like to know how one of these beasties is constructed- it looks like the exposed connectors are merely printed onto the IC-like casing.
Would someone like to do me a favour and destructively disassemble this thing (it died due to some sort of overload, taking 3.5GB of my files with it)
Internal short present between D+ and D- which is a weird fault.
Thanks in advance,
-Andre
Re: Etch the coating off a 4GB pendrive?
Bjørn, Wed Apr 02 2008, 05:52AM
I think the method is to use measured violence to split the package then use hot (85 deg C?) fuming nitric acid to dissolve any epoxy. Sometimes alternating with 20% sulfuric acid. That should hopefully leave the chips and wires more or less intact, at least if there is no moisture present.
If you do it all wrong you might end up with picric acid.
Bjørn, Wed Apr 02 2008, 05:52AM
I think the method is to use measured violence to split the package then use hot (85 deg C?) fuming nitric acid to dissolve any epoxy. Sometimes alternating with 20% sulfuric acid. That should hopefully leave the chips and wires more or less intact, at least if there is no moisture present.
If you do it all wrong you might end up with picric acid.
Re: Etch the coating off a 4GB pendrive?
Electroholic, Wed Apr 02 2008, 05:27PM
if you are not trying to read the silicon, how about xray?
Electroholic, Wed Apr 02 2008, 05:27PM
if you are not trying to read the silicon, how about xray?
Re: Etch the coating off a 4GB pendrive?
Conundrum, Wed Apr 02 2008, 05:48PM
Don't worry, there's not much to look at anyway. I did some dismantling and it has two chips bonded directly to the PCB with cement, and a few discretes.
-A
Conundrum, Wed Apr 02 2008, 05:48PM
Electroholic wrote ...
if you are not trying to read the silicon, how about xray?
if you are not trying to read the silicon, how about xray?
Don't worry, there's not much to look at anyway. I did some dismantling and it has two chips bonded directly to the PCB with cement, and a few discretes.
-A
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