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Operating_Systems/Disks.md
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@ -16,9 +16,12 @@ A disk is a mass storage [device](./Devices.md) which we can write to and read f
## Disk schematic ## Disk schematic
The following diagram represents the basic anatomy of a disk device. The following diagram represents the basic anatomy of a disk device.
![](/img/harddisk.png)
* A disk is divided up into *partitions* which are subsections of the overall disk. The kernel presents each partition as a [block device](./Devices.md#Devices.md) as it would with an entire disk. * A disk is divided up into *partitions* which are subsections of the overall disk. The kernel presents each partition as a [block device](./Devices.md#Devices.md) as it would with an entire disk.
* The disk dedicates a small part of its contents to a *partition table*: this defines the different partitions that comprise the total disk space. * The disk dedicates a small part of its contents to a *partition table*: this defines the different partitions that comprise the total disk space.
* The *filesystem* is a database of files and directories: this comprises the bulk of the partition and is of course what you interact with in [user space](./User_Space.md) when reading and writing data. * The *filesystem* is a database of files and directories: this comprises the bulk of the partition and is what you interact with in [user space](./User_Space.md) when reading and writing data.
## Partitioning disks ## Partitioning disks
@ -56,8 +59,15 @@ Device Start End Sectors Size Type
/dev/nvme0n1p2 1001472 59594751 58593280 27.9G Linux filesystem /dev/nvme0n1p2 1001472 59594751 58593280 27.9G Linux filesystem
/dev/nvme0n1p3 59594752 1000214527 940619776 448.5G Linux filesystem /dev/nvme0n1p3 59594752 1000214527 940619776 448.5G Linux filesystem
``` ```
The two tools disclose the following information:
So my main harddrive is `/dev/nvme0n1` and it has the standard three partitions: So my main harddrive is `/dev/nvme0n1` (equivalent to and it has the standard three partitions:
* Boot partition (`/dev/nvme0n1p1`) * Boot partition (`/dev/nvme0n1p1`)
* Root dir (`/dev/nvme0n1p2`) * Root dir (`/dev/nvme0n1p2`)
* Home dir (`/dev/nvme0n1p3`) * Home dir (`/dev/nvme0n1p3`)
## ! To cover
What is gpt/uefi/efi
ext-4 and dos etc