cool hit counter Science Guide Phase 1 - Hard Drive Overview_Intefrankly

Science Guide Phase 1 - Hard Drive Overview


This issue looks at.

Introduction, classification and simple comparison of mechanical and solid state drives

The hard drive occupies an inconspicuous position in our daily life, but it is indeed a very important existence, from the storage of small ladies to the data processing of servers, the existence of the hard drive is indispensable. Moreover, hard drives handle everyday computer use, in many places we are not familiar with, such as military, medical, aviation, power, monitoring, web services and other fields, where data storage is needed there is a need for hard drives, hard drives are like a faithful recorder of history, in silence to engrave the traces left by mankind.

Classification according to current hard drive architecture, There are two types of mainstream hard drives on the market today, mechanical hard drive(Hard Drive Disk) harmony solid state drive(Solid State Disk)。 In previous years there was a mix of solid state drive The emergence of storage products such as, However, due to solid state drive popularity and lower production costs, These products have long been discontinued。

mechanical hard drive

( Inside an ordinary desktop computer mechanical hard drive)

A mechanical hard disk (HDD), a storage device consisting of a mechanical structure such as a magnetic head and a disk. The specific write read of a hard drive is somewhat similar to the write read of a CD-ROM, except that the speed, environment and sequence of read and write of a mechanical hard drive are very different from those of a CD-ROM. This is because the mechanical hard drive is extremely fine workmanship (arguably the most demanding device in the field of public machinery workmanship), mechanical hard drive is through the high-speed rotation of the disk with the head on the hard drive to scratch a certain track to record data, in order to ensure the normal fast operation of the mechanical hard drive, the internal hard drive can not have dust and other debris, the general general internal is filled with filtered air, enterprise grade mechanical hard drive is filled with a more pure helium to ensure the normal working condition of the mechanical hard drive.

( mechanical hard drive Internal robot arm and turntable)

The mainstream sizes of mechanical hard drives are currently 3.5 inches and 2.5 inches. 3.5-inch mechanical hard drive is mostly used in desktop computers or servers, because its speed is faster, the power consumption required has exceeded the amount of USB power supply, generally need an external power supply to assist in power supply, and most of the 3.5-inch mechanical hard drive weighs more than 1KG, basically no more portability. The 2.5-inch mechanical hard drive, on the other hand, generally weighs around 150g and does not require an auxiliary power supply, making it suitable for use with external hard drive cases and laptop hard drives.

(two main sizes of mechanical discs currently available)

After talking about the size and then talking to you about the RPM, The current home mechanical hard drive revolutions, There are generally5400PPM harmony7200PPM two,2.5 Inches are mostly per minute5400 forward (mail), but (not)3.5 Inches are mostly7200 revolutions per minute, consequently3.5 inch (unit of length equal 2.54 cm.) mechanical hard drive Although the size and weight consume more power than2.5 inch, But the actual experience is also faster than2.5 inch mechanical hard drive quite a bit faster。 enterprise-class mechanical hard drive May have higher RPM and cache, Of course the price won't be low either。

Mechanical hard drives have now been on the market for decades, from the size of a few playgrounds to a few inches in size, and the capacity has grown from a few MB at the beginning to write a single disk can have more than a dozen TB of capacity, although mechanical hard drives can still break the historical bottleneck, but the speed is far from its competitor - solid state drives (SSD).

solid state drive

(intel's enterprise SSD)

A solid-state drive (SSD) is a storage device that uses solid-state memory chips (flash particles) and a controller chip (master) to form a storage array. Simply put, a solid state drive is a storage drive that ditches all the mechanics of a mechanical hard drive and uses a new storage technology to make it. Because it does not require a precise and complex mechanical structure, solid state drives can be applied to a much wider range of environments than mechanical drives, and can work stably in harsh environments such as shaking, vibration, and low temperatures. And solid-state drives use all-solid-state flash memory chips, theoretically read and write speed than mechanical hard drives do not know where to go, and can also be very practical experience out, such as a newly installed SSD computer, boot up as long as 5 seconds to 10 seconds, while ordinary mechanical hard drives may take anywhere from 20 seconds to 40 seconds to boot up. I have been fighting for five years of solid state drives are faster than the desktop mechanical hard drive I just bought, so I can see that the speed of SSD can still hang mechanical hard drives.

(Flash memory particles and master controller chip inside the SSD)

SSDs come in a variety of sizes, especially in the first few years when SSDs were first known to the public, with specifications such as SATA-3, SAS, MSATA, PCI-E, and M.2 interfaces dazzling consumers, including MSATA interface specifications and full-height and half-height sizes, and M.2 interface specifications of 2242, 2260, 2280, and 22110 sizes, with two different specifications for SATS rates and NVMe rates. This is due to the fact that SSD products are updated much faster than mechanical hard drives, and the relative complexity of different product applications, coupled with the "personalization" of computer manufacturers, has led to a variety of interfaces and sizes of solid state drives appearing on the market again at one time. By now, many sizes of SSDs have actually faded from the consumer's eye, and perhaps manufacturers don't want to be so complicated. The current mainstream SSD specifications are mainly 2.5-inch with SATA3 interface specifications and 2280 with M.2 interface specifications, where the 2280's M.2 interface is divided into SATA rate and with NVMe protocol. Players should pay attention when shopping, because as long as the motherboard supports the NVMe protocol, the speed of M.2 SSDs with NVMe protocol is several times higher compared to the speed of ordinary SATA interfaces, but the premise is still the motherboard support.

(Various M.2 SSDs of different sizes or protocols)

We'll be updating this article with an article dedicated to SSD sizes, interfaces, protocols, how they work, etc. This is a simple introduction for the uninitiated.

The introduction of solid-state drives is a testament to the speed of technological development, which in just ten years has overturned the speed of 70 years of mechanical hard drive accumulation. While it's true that mechanical hard drives aren't really on the way out, there's not much chance of them overtaking solid state drives anymore. Maybe in a future generation, SSD will be the shorthand for hard drives.

SSD House

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