Become a fan of Slashdot on Facebook

 



Forgot your password?
typodupeerror

Comment Re:Par for the course.. (Score 2, Informative) 386

The trick isn't using /dev/zero, the trick is using the seek parameter. The dd command skips nearly 8 GiB into a newly created file and writes something there. This creates a file that is 8 GiB large, but with no data (not zero, just nothing at all) in the first 8191 MiB. Therefore, the system doesn't actually write anything there, and doesn't even allocate the storage. If you read from these blocks, you will get generated zeros. This is called a sparse file.

Slashdot Top Deals

What is algebra, exactly? Is it one of those three-cornered things? -- J.M. Barrie

Working...