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How long will this take?
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Senior User
Join Date: Jun 2002
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If I wiped my HD using Tiger's highest security measure (zero-ing out the HD with 35 passes), does anybody know how long it would take to wipe a 40MB disk?
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17" MacBook Pro 2.66 GHz Intel Core 2 Duo | 320G HD | 4 GB RAM | 10.7
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Mac Elite
Join Date: Nov 2001
Location: Trafalmadore
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Originally Posted by Buck_W
If I wiped my HD using Tiger's highest security measure (zero-ing out the HD with 35 passes), does anybody know how long it would take to wipe a 40MB disk?
I can't resist. 40MB won't take long at all.
Now 40GB would take a long time, depending on the drive type and speed. Are there actually published specs for such a thing?
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Addicted to MacNN
Join Date: Jan 2001
Location: The Sar Chasm
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I'm willing to bet at least 20-30 hours.
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When a true genius appears in the world you may know him by this sign, that the dunces are all in confederacy against him. -- Jonathan Swift.
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Senior User
Join Date: Jun 2002
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Originally Posted by SMacTech
I can't resist. 40MB won't take long at all.
Now 40GB would take a long time, depending on the drive type and speed. Are there actually published specs for such a thing?
OOPS! You got me! I meant 40GB 
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17" MacBook Pro 2.66 GHz Intel Core 2 Duo | 320G HD | 4 GB RAM | 10.7
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Senior User
Join Date: Oct 2004
Location: Vancouver, BC
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Yeah, I'd say a couple of days. Unless you work for some top government agency and you are a spy, 0'ing the data should be just fine.
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Senior User
Join Date: Jun 2002
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Originally Posted by Fusion
Yeah, I'd say a couple of days. Unless you work for some top government agency and you are a spy, 0'ing the data should be just fine.
I figured it would be a rather lengthy process (and a lot of overkill). I was just curious since Apple made that option available. Simply zero-ing (single pass) out the disk appears to be the best idea.
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17" MacBook Pro 2.66 GHz Intel Core 2 Duo | 320G HD | 4 GB RAM | 10.7
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Forum Regular
Join Date: Aug 2005
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I did a single pass zero on a 300-GB firewire hard drive and it took about 6 hours. For your 40-GB drive, I would then estimate about 0.5 hrs, but you want to do it 35 times, so that sounds like about 18 hrs to me. Probably about 50% uncertainty on this projection.
I was surprised at how long it took my single pass to zero the disk. There is a little progress bar that appears. I found that just using a ruler to measure what percent it was done (it didn't provide any other indication on the G4 10.3.9 laptop I was running on) was pretty accurate. After one hour, I estimated just with the ruler that it was about 15% done, and it turned out that was about right.
For your 35 passes (why?), I would plan on at least a day of being out of commision. I wouldn't do anything else with the computer while it is busy with such a task.
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