diff --git a/Operating_Systems/Devices.md b/Operating_Systems/Devices.md
index 65a1097..ebb8f87 100644
--- a/Operating_Systems/Devices.md
+++ b/Operating_Systems/Devices.md
@@ -6,10 +6,10 @@ tags:
 
 # Devices
 
-Devices are hardware that require access to the CPU in order to function. Devices can either be external and pluged-in or internal to the motherboard. The most common type of device that you will work with are 
+Devices are hardware that require access to the CPU in order to function. Devices can either be external and plugded-in or internal to the motherboard. The most common type of device that you will work with are 
 [disks](./Disks.md). 
 
-Devices are files but they have some different capabilities that ordinary files. There are two types: **block** and **stream**. Device files reside in the `/dev/` directory.
+Devices are files but they have some different capabilities than ordinary files. There are two types: **block** and **stream**. Device files reside in the `/dev/` directory.
 
 Some of the most important device files are:
 * `hda` : a harddisk on a port
diff --git a/Operating_Systems/Disks.md b/Operating_Systems/Disks.md
index 3d1d71d..8a4e9b1 100644
--- a/Operating_Systems/Disks.md
+++ b/Operating_Systems/Disks.md
@@ -5,3 +5,59 @@ tags:
 ---
 
 # Disks
+A disk is a mass storage [device](./Devices.md) which we can write to and read from.
+
+## SCSI
+* Small Computer System Interface
+* Pronounced _scuzzy_. 
+* It is a protocol that allows communicaton between printers, scanners and other peripherals in addition to harddisks. 
+* The `/sda/` device that is the most common designation for the harddisk in Linux systems stands for *SCSI disk*.
+
+## Disk schematic
+The following diagram represents the basic anatomy of a disk device.
+
+* 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 *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. 
+
+ ## Partitioning disks 
+
+### Viewing current partitions
+Whenever you install a Linux distribution on a real or virtual machine, you must partition the drive. There are three main tools that people choose from: `parted`, `g(raphical)parted`, `fdisk`.
+
+We can use `parted -l` to view the partition table for the current machine:
+
+```bash
+Model: SKHynix_HFS512GDE9X081N (nvme)
+Disk /dev/nvme0n1: 512GB
+Sector size (logical/physical): 512B/512B
+Partition Table: gpt
+Disk Flags: 
+
+Number  Start   End     Size    File system  Name  Flags
+ 1      1049kB  513MB   512MB   fat32              boot, esp
+ 2      513MB   30.5GB  30.0GB  ext4
+ 3      30.5GB  512GB   482GB   ext4
+```
+
+We can use `fdisk -l` to get slightly more info:
+
+```bash
+disk /dev/nvme0n1: 476.94 GiB, 512110190592 bytes, 1000215216 sectors
+Disk model: SKHynix_HFS512GDE9X081N                 
+Units: sectors of 1 * 512 = 512 bytes
+Sector size (logical/physical): 512 bytes / 512 bytes
+I/O size (minimum/optimal): 512 bytes / 512 bytes
+Disklabel type: gpt
+Disk identifier: 08175E77-CB9F-C34A-9032-DF29A3F8F0FE
+
+Device            Start        End   Sectors   Size Type
+/dev/nvme0n1p1     2048    1001471    999424   488M EFI System
+/dev/nvme0n1p2  1001472   59594751  58593280  27.9G Linux filesystem
+/dev/nvme0n1p3 59594752 1000214527 940619776 448.5G Linux filesystem
+```
+
+So my main harddrive is `/dev/nvme0n1` and it has the standard three partitions:
+* Boot partition (`/dev/nvme0n1p1`)
+* Root dir (`/dev/nvme0n1p2`)
+* Home dir (`/dev/nvme0n1p3`)
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