Yes, but major manufacturers Western Digital, Toshiba, Seagate, and others tend to follow the same processes when manufacturing hard drive platters. Major manufacturers are moving towards glass, since hard drives are shrinking and glass offers several major advantages over aluminum in small spaces.
New types of glass are extremely flat, so the heads can get closer to the hard drive platters. Manufacturers can also eliminate some of the steps that they use to smoothen aluminum drives, saving money in the production process. Aluminum is still less expensive overall, but the cost of glass platters has come down considerably.
Gorilla Glass is an alkali-aluminosilicate glass developed by Corning that's primarily used as cover glass for mobile devices. Because it's resilient, durable and remarkably thin, it has been made to safeguard displays and touch screens without compromising the screen or adding bulkiness to the View Full Term. By clicking sign up, you agree to receive emails from Techopedia and agree to our Terms of Use and Privacy Policy.
A platter is a circular magnetic plate that is used for storing data in a hard disk. It is often made of aluminum, glass substrate or ceramic. A hard disk drive contains several platters that are mounted on the same spindle. The platter is very sensitive, and any contamination can often make the affected area unreadable, leading to data loss. The platter is capable of holding large amount of data.
This rate varies depending on the model of hard drive you have; an example of how fast a hard drive may spin is RPM. To help store and retrieve the data from the platter, data is stored in tracks , sectors , and cylinders on each platter. Pictured above is the inside of a hard drive, with its platter indicated. A typical hard drive is only slightly larger than your hand, yet can hold over GB of data. The data is stored on a stack of disks that are mounted inside a solid encasement.
These disks spin extremely fast typically at either or RPM so that data can be accessed immediately from anywhere on the drive. The data is stored on the hard drive magnetically, so it stays on the drive even after the power supply is turned off.
However, all three of these terms usually refer to the same thing — the place where your data is stored. A hard disk drive HDD , hard disk, hard drive, or fixed disk [b] is an electromechanical data storage device that uses magnetic storage to store and retrieve digital information using one or more rigid rapidly rotating disks platters coated with magnetic material. The platters are paired with magnetic heads , usually arranged on a moving actuator arm, which read and write data to the platter surfaces.
HDDs are a type of non-volatile storage , retaining stored data even when powered off. It was approximately the size of two medium-sized refrigerators and stored five million six-bit characters 3. Motion of the head array depended upon a binary adder system of hydraulic actuators which assured repeatable positioning. The cabinet was about the size of three home refrigerators placed side by side, storing the equivalent of about 21 million eight-bit bytes.
Access time was about a quarter of a second. A modern HDD records data by magnetizing a thin film of ferromagnetic material on both sides of a disk.
Sequential changes in the direction of magnetization represent binary data bits. The data is read from the disk by detecting the transitions in magnetization.
User data is encoded using an encoding scheme, such as run-length limited encoding, which determines how the data is represented by the magnetic transitions. A typical HDD design consists of a spindle that holds flat circular disks, called platters , which hold the recorded data. The platters are made from a non-magnetic material, usually aluminum alloy, glass, or ceramic. They are coated with a shallow layer of magnetic material typically 10—20 nm in-depth, with an outer layer of carbon for protection.
The amount of storage on a hard disk is measured in gigabytes and terabytes. Hard drive capacity is measured by the amount of data users need to store, which is often much greater than the space applications take up.
For example, a single video can take up four gigabytes of space. A hard disk is the primary computer storage medium, which is made of one or more aluminum or glass platters, coated with a ferromagnetic material. All computers used to have an internal hard disk for storage; however, today, storage can be solid-state SSD. Disks store programs and data until deliberately deleted by the user, but memory RAM is a temporary workspace.
To learn how this workspace is used to process data, see memory. For a summary of memory and storage types, see storage vs. Capacity is measured in bytes, and the largest drives hold up to 10 terabytes. Speed is measured by transfer rate in megabytes per second as well as latency: how long it takes to begin transferring data, typically 3 to 15 milliseconds ms.
A byte B inar Y T abl E is the common unit of computer storage from a desktop computer to mainframe. It is made up of eight binary digits bits. A ninth bit may be used in the memory RAM circuits as a parity bit for error checking.
A byte holds one alphabetic character such as the letter A, a dollar sign, or decimal point. IBM coined the term in the mids to mean the smallest addressable group of bits in a computer, which was originally not eight. Drives and memory RAM are rated in bytes. For example, a gigabyte GB drive stores billion characters of program instructions and data permanently, while eight gigabytes 8GBs of RAM holds eight billion temporarily.
A SSD Solid State Drive is an all-electronic non-volatile storage device that is an alternative to, and is increasingly replacing, hard disks. They are also more rugged and reliable and offer greater protection in hostile environments.
In addition, SSDs use less power and are not affected by magnets. In time, there will only be solid-state storage, and spinning disk platters will be as obsolete as the punch card. However, for the absolute fastest storage speed obtainable, there are SSDs that use volatile RAM chips backed up by non-volatile storage in case of power failure. In its simplest form, an SSD is flash storage and has no moving parts. HDD storage is made up of magnetic tape and has mechanical parts inside. The primary characteristics of an HDD are its capacity and performance.
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