Looking at this from the other point of view, with the ever-increasing data density on disk platters and a corresponding reduction in feature size and use of exotic techniques to record data on the medium, it's unlikely that anything can be recovered from any recent drive except perhaps a single level via basic error-cancelling techniques. This was true in 1996, and is still true now. As the paper says, "A good scrubbing with random data will do about as well as can be expected". For any modern PRML/EPRML drive, a few passes of random scrubbing is the best you can do. If you're using a drive which uses encoding technology X, you only need to perform the passes specific to X, and you never need to perform all 35 passes. In fact performing the full 35-pass overwrite is pointless for any drive since it targets a blend of scenarios involving all types of (normally-used) encoding technology, which covers everything back to 30+-year-old MFM methods (if you don't understand that statement, re-read the paper). As a result, they advocate applying the voodoo to PRML and EPRML drives even though it will have no more effect than a simple scrubbing with random data. In the time since this paper was published, some people have treated the 35-pass overwrite technique described in it more as a kind of voodoo incantation to banish evil spirits than the result of a technical analysis of drive encoding techniques. Clean it off - moist rag is usually enough. Let Software Update run until it doesn't find anything.ĥ.
SELLING A MACBOOK PRO WITH NEW HARDRIVE INSTALL
Install whatever iLife it came with (same deal, if an upgrade, include media).Ĥ. Install the licensed OS for it (if it's not what it came with, include media/etc).ģ. A single pass of zeros is enough for most people.Ģ. If it's sensitive, I'll do a 7 pass, but. ^ If you're going to include Leopard on the laptop, throw in a Leopard disk. I've seen some pretty nasty laptops on sale.
Unless a Leopard license comes with that MacBook, it's not legal to leave it on there - kinda like those value-added Macs with "OMG FREE SOFTWARE $2400 value!!1one".Ĭlean the thing. Do a seven-pass if it helps you sleep more easily at night, but keep in mind that it will take a while.
SELLING A MACBOOK PRO WITH NEW HARDRIVE MAC OS X
Boot off the Mac OS X Install Disc and use Disk Utility to do a zero of the drive before restoring the original system software.
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