Magnetic disk is a storage device commonly known as a hard disk.
Read-write head is responsible for reading and writing data on the magnetic disk.
There are two types of heads in a hard disk: fixed head and moving head.
🔑 Harddisk with moving head is slower than harddisk with fix head because the moving head needs to change its position to read and write data.
🔑 Shock Protection System (SPS) technology reduces the risk of damage to harddisks caused by unintentional shocks.
🔑 Smart technology allows harddisks to communicate with computers, perform self-checks, and provide reports on their condition.
🔑 Solid State Disks (SSD) offer faster data reading and writing speeds compared to harddisks with magnetic disks.
🔑 Magnetoresistive head technology replaces the older inductive head technology in harddisks, allowing for simultaneous read and write processes.
✨ The video discusses various technologies and algorithms related to disk scheduling.
💡 One of the technologies mentioned is Maximum Likelihood, which converts analog data to digital data, resulting in higher data density and increased data storage capacity.
🔌 Hotswap and plug n play are popular features that allow users to add hardware to a computer without turning it off and easily configure and use the new hardware.
🌱 Environment Protection Agency (EPA) is a technology that helps save energy by enabling power-saving features in hard disks.
🔧 Error Correction Code (ECC) is a technology that can correct reading errors in magnetic disks without having to reread the entire track and sector.
⚡️ Auto transfer is a method that accelerates data transfer from a hard disk to the main memory by using parallel read and write commands.
📝 Data transfer can be accelerated by utilizing third-party servers with advanced features.
💽 The last topic discussed is disk access, which includes algorithms for service order and backup during reading.
➡️ The first algorithm discussed is the First-Come-First-Served (FCFS) algorithm, which serves the first request in the queue.
🔑 The video discusses disk scheduling algorithms, specifically focusing on the SCAN algorithm.
⏭️ The SCAN algorithm prioritizes accessing the nearest and furthest tracks from the initial position of the read head.
💡 Another disk scheduling algorithm mentioned is the LRU algorithm, which moves the read head up to the largest track and then down to the smallest track.
📝 The video discusses different disk scheduling algorithms, including FCFS, SSTF, SCAN, C-SCAN, LOOK, and C-LOOK.
🔄 The algorithms FCFS and SSTF access tracks in the order they appear, while SCAN and C-SCAN scan from one end to the other and then retreat.
↕️ LOOK and C-LOOK move towards the closest track and skip tracks that have already been accessed.
🔑 Disk scheduling algorithms determine the order in which disk requests are processed.
⏩ The circular scan algorithm is similar to the scan algorithm, where the head moves from the starting position to the largest track, accessing all the tracks in between.
🔄 Once the head reaches the largest track, it moves directly to the smallest track without accessing any tracks in between.
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