Marc Joliet <mar...@gmx.de> wrote:

> Hi,
>
> I have to failed drives that I want to give away for recycling purposes, but
> want to be sure to properly clear them first.  They used be part of a btrfs

The test patterns used on Solaris and marked with "federal requirements" are:

int purge_patterns[]= {               /* patterns to be written */ 
        0xaaaaaaaa,             /* 10101010... */ 
        0x55555555,             /* 01010101...  == UUUU... */ 
        0xaaaaaaaa,             /* 10101010... */ 
        0xaaaaaaaa,             /* 10101010... */ 
}

Jörg

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