as long as any part of the disc remains, it is readable, data can be recovered.

degaussing or shredding are the best. dod over writing software would be next.

most company's want all of the data destroyed, not part of it. the company's that are the most anal about data destruction, normally are aware of the proper means of destruction.

one of the reasons company's insist on some type of certification they approve of is that they have to trust you to destroy that drive and all of the data it contains. no one is going to want you out in their the parking lot ripping apart computers so you can destroy a 1000 drives or more.

one of the reasons i do not sell drives is that i do not want a client to have any doubts about my services. it looks bad if you pick up a few hundred drives to destroy and 2 weeks later you have few hundred drives for sale on ebay or cl. or you always have an ad running to sell drives.



the occasional times i do get good drives, and have permission to re-sell, i dod wipe and then trade to dealers for scrap.

most of the dealers i work with are looking for 15k sas or scsi or the 10 k raptors. or ssd drives. everything else is scrap.