Re: Is fdisk, disklabel and newfs enough to "reset" an SSD

2013-05-15 Thread Clint Pachl
Jan Stary wrote: If so, how does one "reset" a used SSD for >optimal operation with a fresh install? Just treat it as any other disk - which it is. This is wrong, unfortunately. From the OS perspective, sure, sort of. But there is more to the story. There is overprovising, garbage collectio

Re: Is fdisk, disklabel and newfs enough to "reset" an SSD

2013-05-14 Thread Ted Unangst
On Tue, May 14, 2013 at 15:01, Jan Stary wrote: > >> If so, how does one "reset" a used SSD for >> optimal operation with a fresh install? > > Just treat it as any other disk - which it is. Almost, but not entirely. > > On May 13 22:50:08, pa...@ecentryx.com wrote: >> Scott McEachern wrote: >>

Re: Is fdisk, disklabel and newfs enough to "reset" an SSD

2013-05-14 Thread Jan Stary
On May 13 21:04:00, pa...@ecentryx.com wrote: > I would like to reinstall a fresh system on an SSD that contains an > existing installation. From my limited knowledge of SSDs, I wonder > if the drive controller may "retain" data from the old filesystem, > unaware that there is a new filesystem put

Re: Is fdisk, disklabel and newfs enough to "reset" an SSD

2013-05-13 Thread Christer Solskogen
On Tue, May 14, 2013 at 7:50 AM, Clint Pachl wrote: > > Would dd'ing to the drive all 1s then all 0s be effective? > Yes, and a complete waste of time. 'atactl drive secerase' will do the job for you. hdparm in linux has a similar command. But dd-ing twice is just idiotic. If you must use dd, o

Re: Is fdisk, disklabel and newfs enough to "reset" an SSD

2013-05-13 Thread Clint Pachl
Scott McEachern wrote: 2) Do you mean there could still be data residing on unused parts of the SSD? Yes, it can happen. Yes, this is what I'm referring to. I was hoping there was some way to instruct the drive controller that the entire drive space is "free"? SSDs have their own way of wear-

Re: Is fdisk, disklabel and newfs enough to "reset" an SSD

2013-05-13 Thread Ted Unangst
On Mon, May 13, 2013 at 21:04, Clint Pachl wrote: > I would like to reinstall a fresh system on an SSD that contains an > existing installation. From my limited knowledge of SSDs, I wonder if > the drive controller may "retain" data from the old filesystem, unaware > that there is a new filesystem

Re: Is fdisk, disklabel and newfs enough to "reset" an SSD

2013-05-13 Thread Scott McEachern
On 05/14/13 00:04, Clint Pachl wrote: I would like to reinstall a fresh system on an SSD that contains an existing installation. From my limited knowledge of SSDs, I wonder if the drive controller may "retain" data from the old filesystem, unaware that there is a new filesystem put in place.

Is fdisk, disklabel and newfs enough to "reset" an SSD

2013-05-13 Thread Clint Pachl
I would like to reinstall a fresh system on an SSD that contains an existing installation. From my limited knowledge of SSDs, I wonder if the drive controller may "retain" data from the old filesystem, unaware that there is a new filesystem put in place. Is this a concern? If so, how does one