search for: platter

On Mon, 2016-02-08 at 14:22 -0800, John R Pierce wrote: > the only truly safe way to destroy data on magnetic media is to grind > the media up into filings or melt it down in a furnace. I unscrew the casing, extract the disk platter(s), slide a very strong magnet over both sides of the platter surface then bend the platter in half. How secure is that ? I can't afford a machine that grinds everything into dust particles. -- Regards, Paul. England, EU. England's place is in the European Union.

...tOS mailing list > Subject: Re: [CentOS] Utility to zero unused blocks on disk > > > > >> the only truly safe way to destroy data on magnetic media is to grind > >> the media up into filings or melt it down in a furnace. > > I unscrew the casing, extract the disk platter(s), slide a very strong > > magnet over both sides of the platter surface then bend the platter in > > half. > > > > How secure is that ? > > > > I can't afford a machine that grinds everything into dust particles. > I have seen a guy in the I.T. departmen...

> I'm guessing you're using standard 7,200rpm platter drives? You'll need > to share more information about your environment in order for us to > provide useful feedback. Usually though, the answer is 'caching' and/or > 'faster disks'. Yes , 7.2k rpm disks. 2T mirror (soft). In fact, I had such a preference for slightly m...

Hi everybody, I would like to use ruby2ruby in a caming project, but there seems to be an incompatibility with camping, ruby2ruby and markaby. Unfortunately I receive strange Markaby::InvalidXhtmlErrors. To demonstrate, that only combination of all three components causes the problem I added the following code. I relies on Markaby and ruby2ruby only and works fine (a.k.a. as expected).

...nable the write cache for ext2 and disable it for all journaled file systems. It would be nice if someone with more profound knowledge could comment on this, but my understanding of the problem is: - journaled filesystems can only work when they can enforce that journal data is written to the platters at specifc times wrt normal data writes - IDE write caching makes the disk "lie" to the kernel, i.e. it says "I've written the data" when it was only put in the cache - now if a *power failure* keeps the disk from writing the cache contents to the platter, the fs and...

Working on Rails Engine. I want to make the controllers customizable whereever the Rails Engine is used. Therefore, I was trying to use `extend ActiveSupport::Concern` on the Engine controller class and include it in MyRailsApp. https://gist.github.com/4185823 # code in my rails engine moduel MyEngine class SomeController extend ActiveSupport::Concern def engine_some_method

...I/Owait times. > If your seeing 99% cpu usage then your likely looking at some other problem. > > If you run top what are you seeing on the %Cpu(s) line? > > > On 02/08/2016 02:20 PM, Gokan Atmaca wrote: >>> >>> I'm guessing you're using standard 7,200rpm platter drives? You'll need >>> to share more information about your environment in order for us to >>> provide useful feedback. Usually though, the answer is 'caching' and/or >>> 'faster disks'. >> >> Yes , 7.2k rpm disks. 2T mirror (soft). In fac...

...I''m aware of some 4k alignment issues with Western Digital advanced format disks. As far as I can tell, the Hitachi Deskstar 7K3000 (HDS723030ALA640) uses 512B sectors and so I presume does not suffer from such issues (because it doesn''t lie about the physical layout of sectors on-platter) Can someone confirm this or point out any other known issues with the disks? I will be using the disks raw, unpartitioned. Many thanks, Luis. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.opensolaris.org/pipermail/zfs-discuss/attachments/20120305...

On 09/30/2020 05:40 AM, John Pierce wrote: > On Tue, Sep 29, 2020, 8:33 AM H <agents at meddatainc.com> wrote: > >> I have an old external harddisk, Toshiba 320 Gb, with a USB connector that >> I wanted to check for contents. It did not start up when connected and I >> could not hear the motor spinning. After leaving it in the freezer >> overnight the motor

...n 02/08/2016 07:38 PM, Always Learning wrote: > On Mon, 2016-02-08 at 14:22 -0800, John R Pierce wrote: > >> the only truly safe way to destroy data on magnetic media is to grind >> the media up into filings or melt it down in a furnace. > I unscrew the casing, extract the disk platter(s), slide a very strong > magnet over both sides of the platter surface then bend the platter in > half. > > How secure is that ? > > I can't afford a machine that grinds everything into dust particles. I have seen a guy in the I.T. department where I work take a hard drive....

...t of pause in the shut down to ensure that it IS flushed. >> >> This is also why server grade gear uses battery backed buffers, etc. which are supposed to allow drives to properly flush the data to disk. There is still a slim chance in these cases that the data still will not reach the platter before power off or reboot, especially in catastrophic cases. >> > > This was a reboot from software, not a power drop. Does that do > something to kill the disk cache if anything happened to still be > there? In most cases intentional reboots _shouldn?t_ trigger this, but I c...

DBAN is obsolete. NIST 800-88 for some time now says to use secure erase or enhanced security erase or crypto erase if supported. Other options do not erase data in remapped sectors. Chris Murphy

Hello I use KVM. In a virtual machine "jbd2 dm-0" disk I / O is very increases. It consumes up to 99%. For this reason, slowing down the other virtual machine. What should I do to solve the problem. ? Thanks..

...? to have some sort of pause in the shut down to ensure that it IS flushed. This is also why server grade gear uses battery backed buffers, etc. which are supposed to allow drives to properly flush the data to disk. There is still a slim chance in these cases that the data still will not reach the platter before power off or reboot, especially in catastrophic cases. -- Gary L. Greene, Jr. Sr. Systems Administrator IT Operations Minerva Networks, Inc. Cell: +1 (650) 704-6633

Is there a utility to zero unused blocks on a disk? CentOS 6.7/Ext4 I saw zerofree, but I?m not sure it would work on Ext4 or even work on this version of CentOS. thanks, -wes

...les to retry in successive attempts. The quality of a data-recovery undertaking will depend quite a bit on the exact nature of the drive fault. [rambling on a little further] On more than one occasion, someone caused one of my drives to power-down the spindle while leaving the heads out over the platter. In such an instance, the surface of the heads and platters are sufficiently flat to cause the two to stick together, frustrating platter rotation. You have to physically slide the heads off into the park position. If I'd had a laboratory at the time, I would have attempted to using shims, bu...

...e bytes red and written over time was seesawing between approximately 23MB/s and 0MB/s. It seemed like we read and read and read till we were all full up, then wrote until we were empty, and so the cycle went. Now: as it happens, 31MB/s is about as fast as it gets on this disk at that part of the platter (using dd and large block size on the rdev). (iirc, it actually started out closer to 30MB, so the slower speed might be a red herring...) So, it seems to be below what I would hope to get out of the platter, but it''s not too bad. Whether I: read at 23, write at 0 then read at 0, write a...

...g another old PC running m0n0wall as a firewall. Between these two boxes, that run 24x7, I'm drawing a lot more power than needed and hoping to make a dent in my monthly electric bill by consolidating the two into a single box with efficient power supply, low power processor, and no spinning HD platters. Main question is whether anyone knows if the Digium TDM400P should be compatible with the 3.3V PCI slot in the Soekris Net5501-70 box? Soekris' description for the net5501-70 says, in part, it has support for "one or two low-power standard PCI board" I see on my Digium card that...

Hi all What is the best strategy to add another storage to an existing virtual mail system ? Move some domains to the new storage and create symlinks ? Switch to dovecot hashing ? But in this case what is the easy-east way to migrate ? Thanks for any suggestions or tips !

Hi all, Does anyone know how to determine which file system a disk was formatted with, if fdisk -l doesn't show it? usb-storage: device found at 5 usb-storage: waiting for device to settle before scanning Vendor: Model: Rev: Type: Direct-Access ANSI SCSI revision: 02 sd 7:0:0:0: Attached scsi disk sda sd 7:0:0:0: Attached scsi generic