- Everything eventually breaks. Bootstraping kubernetes with Terraform and libvirt 8 Aug 2020 terraform libvirt kubernetes.
- Wipefs would be telling you the same thing, if you didn't use -f -f, -force Force erasure, even if the filesystem is mounted. If the device is still in use, that's a serious issue as whatever is using the device might modify data on the device.
Version-Release number of selected component (if applicable): util-linux-2.27.1-2.fc23.x8664 How reproducible: Always Steps to Reproduce: 1. Dd if= of= bs=1M count=20 2. Wipefs -a /dev/sdb123 3. Wipefs -a /dev/sdb Actual results: # wipefs -a /dev/sdb123 /dev/sdb1: 5 bytes were erased at offset 0x00008001 (iso9660.
As you may know, simply deleting a file does not actually delete the content of the file. Instead, the space that file occupied on the disk is simply marked as being 'free', and may exist for a long time until another file is allocated that space (or part of it).
The time it takes to wipe a volume depends on the size of the volume, the speed of your computer (and amount of RAM), and how many passes you specify. Obviously, 8 passes will take approximately eight times longer than 1 pass.
This application needs to create temporary files on the drives whose free space is being wiped. If you choose a drive outside of the drive where your user-account is you will be asked to select a folder in which this app can store temporary files. The root folder is usually the most convenient place. The files created by this app will be cleaned-up after the free space has been successfully wiped or the process is aborted using the 'Stop' button.
In the event the temporary files created by the application are not deleted, re-select the drives and then click the 'Clean up' button. You will need to supply the folder(s) you choose initially (if applicable) and then you will regain any lost disk space.
Panoramica
WipeFS è un software di Demo nella categoria (2) sviluppato da CodeInventors.
L'ultima versione di WipeFS is 1.2, pubblicato su 14/11/2014. Inizialmente è stato aggiunto al nostro database su 14/11/2014.
WipeFS viene eseguito sui seguenti sistemi operativi: Windows.
WipeFS non è stato valutato dai nostri utenti ancora.
Scrivi una recensione per WipeFS!
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This article or section needs expansion.
From Wikipedia:
- In Unix-like operating systems, a device file or special file is an interface to a device driver that appears in a file system as if it were an ordinary file.
On Linux they are in the /dev directory, according to the Filesystem Hierarchy Standard.
On Arch Linux the device nodes are managed by udev.
Block devices
A block device is a special file that provides buffered access to a hardware device. For a detailed description and comparison of virtual file system devices, see Wikipedia:Device file#Block devices.
Block device names
The beginning of the device name specifies the kernel's used driver subsystem to operate the block device.
SCSI
Storage devices, like hard disks, SSDs and flash drives, that support the SCSI command (SCSI, SAS, UASP), ATA (PATA, SATA) or USB mass storage connection are handled by the kernel's SCSI driver subsystem. They all share the same naming scheme.
The name of these devices starts with sd. It is then followed by a lower-case letter starting from a for the first discovered device (sda), b for the second discovered device (sdb), and so on.
Examples:
/dev/sda- devicea, the first discovered device./dev/sde- devicee, the fifth discovered device.
NVMe
The name of storage devices, like SSDs, that are attached via NVM Express (NVMe) starts with nvme. It is then followed by a number starting from 0 for the device controller, nvme0 for the first discovered NVMe controller, nvme1 for the second, and so on. Next is the letter 'n' and a number starting from 1 expressing the device on a controller, i.e. nvme0n1 for first discovered device on first discovered controller, nvme0n2 for second discovered device on first discovered controller, and so on.
Examples:
/dev/nvme0n1- device1on controller0, the first discovered device on the first discovered controller./dev/nvme2n5- device5on controller2, the fifth discovered device on the third discovered controller.
MMC
This article or section needs expansion.
/dev/mmcblkXboot{0,1}[1] and /dev/mmcblkXrpmb[2]. (Discuss in Talk:Partitioning#mmcblk0p{1,2,3,4}, mmcblk0boot{0,1}, mmcblk0rpmb)SD cards, MMC cards and eMMC storage devices are handled by the kernel's mmc driver and name of those devices start with mmcblk. It is then followed by a number starting from 0 for the device, i.e. mmcblk0 for first discovered device, mmcblk1 for second discovered device and so on.
Examples:
/dev/mmcblk0- device0, the first discovered device./dev/mmcblk4- device4, the fifth discovered device.
SCSI optical disc drive
The name of optical disc drives (ODDs), that are attached using one of the interfaces supported by the SCSI driver subsystem, start with sr. The name is then followed by a number starting from 0 for the device, ie. sr0 for the first discovered device, sr1 for the second discovered device, and so on.
Udev also provides /dev/cdrom that is a symbolic link to /dev/sr0. The name will always be cdrom regardless of the drive's supported disc types or the inserted media.
Examples:
/dev/sr0- optical disc drive0, the first discovered optical disc drive./dev/sr4- optical disc drive4, the fifth discovered optical disc drive./dev/cdrom- a symbolic link to/dev/sr0.
virtio-blk
The name of drives attached to a virtio block device (virtio-blk) interface start with vd. It is then followed by a lower-case letter starting from a for the first discovered device (vda), b for the second discovered device (vdb), and so on.
Examples:
/dev/vda- devicea, the first discovered device./dev/vde- devicee, the fifth discovered device.
Partition
Partition device names are a combination of the drive's device name and the partition number assigned to them in the partition table, i.e. /dev/drivepartition. For drives whose device name ends with a number, the drive name and partition number is separated with the letter 'p', i.e. /dev/driveppartition.
Examples:
/dev/sda1- partition1on/dev/sda./dev/nvme2n5p3- partition3on/dev/nvme2n5./dev/mmcblk3p4- partition4on/dev/mmcblk3./dev/vda1- partition1on/dev/vda./dev/loop0p2- partition2on/dev/loop0.
Utilities
lsblk
The util-linux package provides the lsblk(8) utility which lists block devices, for example:
In the example above, only one device is available (sda), and that device has three partitions (sda1 to sda3), each with a different file system.
wipefs
This article or section needs expansion.
How To Erase Computer And Start Over
wipefs can list or erase file system, RAID or partition-table signatures (magic strings) from the specified device to make the signatures invisible for libblkid(3). It does not erase the file systems themselves nor any other data from the device.
See wipefs(8) for more information.
For example, to erase all signatures from the device /dev/sdb and create a signature backup ~/wipefs-sdb-offset.bak file for each signature:
Pseudo-devices
Device nodes that do not have a physical device.
- /dev/random, see random(4)
- /dev/null, /dev/zero, see null(4)
- /dev/full, see full(4)
- /dev/ttyX, where X is a number
See also
Vfat Signature