I'm reading like crazy to understand the typical process. I have been going by Lonnie Dworkin's detailed testimony from day 12, but it sounds to me (and it's really hard to tell since we must rely on Twitter and liveblogged translations of testimony) that BN is doing something different than what Det. Melendez and Dworkin did. This may be why he is finding stuff that the other two did not.
From what I've read, the process is not standard and even in law enforcement, each investigator seems to have his own work method. However, there are some standards that are required, especially in capital criminal cases.
National Institute of Standards and Technology requires that the investigator:
1. Write block the original disk
2. Make a full-volume, bit stream, bit-for-bit, sector by sector forensic image of the original disk, copying onto a new or sanitized re-used blank hard drive
3. Verify that it is an exact copy by comparing checksum MD5 or SHA-1 hash values
4. Return the original disk to evidence
5. Document everything he does
After that, it looks like there are a zillion forks. I can't find anywhere that the forensic copy must be read-only, but I'm sure that's what Lonnie Dworkin testified that EnCase does. It makes sense to me.
From what I've read of BN's testimony, he is working on a live, writable clone of TA's drive and he's removing software (viruses, for instance) as he examines it. This is why his copies are not the same capacity in GB as TA's original drive any more. He has given the prosecution at least one copy of his work materialsI have completely lost track of who has what now.
Evidently BN did not give the prosecution the forensic image (the one that should be exactly the same as TA's hard drive in evidence) that he started with? I did read somewhere that he wanted to know if Juan wanted the image, not the clone, and then BN tried to tell him that he already had what he was asking for.
Sorry if I took this on a bit of a tech tangent. It's technical stufflike legalesewe have to use the lexicon that comes with it or we'll get even more confused. If I'm misusing terms, let me know. I'm trying to be careful, but I don't know...