On 5 Apr 2018 at 8:36, Samuel Sieb wrote: Subject: Re: OT:Question on NVME disk direct access? To: users@xxxxxxxxxxxxxxxxxxxxxxx From: Samuel Sieb <samuel@xxxxxxxx> Date sent: Thu, 5 Apr 2018 08:36:20 -0700 Send reply to: Community support for Fedora users <users@xxxxxxxxxxxxxxxxxxxxxxx> > On 04/05/2018 12:59 AM, Todd Chester wrote: > > If you what to completely blank a disk out, don't mess around with that > > operating system whose name I shall not mention. (I hear it is slow, > > buggy, and expensive.) Stay in Linux. > > > > # dd bs=1M if=/dev/zero of=/dev/sdx > > If I understood the original post correctly, the person was wanting to > blank the free space, not erase the whole disk. The problem was that > the program used was a secure eraser which filled the blank space with > random data which doesn't compress. It has now been confirmed that is the case. The user has used the G4L included cleaning options for the free space on the partitions, and is seeing a compression rate of close to 90%. The Eraser programs current documentation online seems to show default option is a security erase rather than a clearing out with zeroing. Program does have an option for that, but not default. G4L creates a 0bits file that it writes nulls to, until the partition is full and then deletes file. With Fat32 partitions, it creats multiple 2G files till partition full, and then deletes them. It doesn't blank out disks or partitions. Exception is for swap partition of linux, where it does get blkid info of partition, then zeros out partitions, and recreates the swap partition with same blkid info. Thanks. > _______________________________________________ > users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx > To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx +------------------------------------------------------------+ Michael D. Setzer II - Computer Science Instructor (Retired) mailto:mikes@xxxxxxxx mailto:msetzerii@xxxxxxxxx Guam - Where America's Day Begins G4L Disk Imaging Project maintainer http://sourceforge.net/projects/g4l/ +------------------------------------------------------------+ http://setiathome.berkeley.edu (Original) Number of Seti Units Returned: 19,471 Processing time: 32 years, 290 days, 12 hours, 58 minutes (Total Hours: 287,489) BOINC@HOME CREDITS ROSETTA 65145396.630944 | ABC 16613838.513356 SETI 109336776.035164 | EINSTEIN 141006633.999240 _______________________________________________ users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx
