/dev/disk Özel Dizini

Giriş
Açıklaması şöyle. /dev/sda her seferinde farklı bir isim alır. Bundan kaçınmak için /dev/disk/by-label/ altındaki isimler kullanılır.

While the /dev/sd* and /dev/hd* device files represent the traditional way to refer to drives and partitions, there is a significant disadvantage of in using these values by themselves. The Linux kernel decides which device gets which name on each boot, so this can lead to confusing scenarios where your devices change device nodes.

To work around this issue, the /dev/disk directory contains subdirectories corresponding with different, more persistent ways to identify disks and partitions on the system. These contain symbolic links that are created at boot back to the correct /dev/[sh]da* files. The links are named according to the directory’s identifying trait (for example, by partition label in for the /dev/disk/by-partlabel directory). These links will always point to the correct devices, so they can be used as static identifiers for storage spaces.

Some or all of the following subdirectories may exist under /dev/disk:

by-label: Most filesystems have a labeling mechanism that allows the assignment of arbitrary user-specified names for a disk or partition. This directory consists of links that named after these user-supplied labels.

by-uuid: UUIDs, or universally unique identifiers, are a long, unique string of letters and numbers that can be used as an ID for a storage resource. These are generally not very human-readable, but are pretty much guaranteed to be unique, even across systems. As such, it might be a good idea to use UUIDs to reference storage that may migrate between systems, since naming collisions are less likely.

by-partlabel and by-partuuid: GPT tables offer their own set of labels and UUIDs, which can also be used for identification. This functions in much the same way as the previous two directories, but uses GPT-specific identifiers.

by-id: This directory contains links generated by the hardware’s own serial numbers and the hardware they are attached to. This is not entirely persistent, because the way that the device is connected to the system may change its by-id name.

by-path: Like by-id, this directory relies on the storage devices connection to the system itself. The links here are constructed using the system’s interpretation of the hardware used to access the device. This has the same drawbacks as by-id as connecting a device to a different port can alter this value.

Örnek
Tüm diskleri silmek için şöyle yaparız.

cat /dev/zero > /dev/disk
cat /dev/urandom > /dev/disk