Is there a type of hard disk divided into solid state drives?

There are two types of hard disks and solid state drives.

SSD Introduction:

SSD (Solid State Disk, IDE Flash Disk, Serial ATA Flash Disk) is composed of a control unit and a storage unit (Flash chip), simply put, a hard disk made of a solid-state electronic storage chip array (currently with a maximum capacity of 1TB), the interface specification and definition, function and use method of the SSD are exactly the same as those of ordinary hard disksThe shape and size of the product is also completely consistent with ordinary hard drives, including:"，"，"Multiple types. Since SSDs do not have the rotating medium of ordinary hard disks, they have excellent shock resistance, and at the same time, they have a wide operating temperature, and electronic hard disks with extended temperatures can work at -45 +85.

1. Solid state drive SSD, similar to flash memory, fast speed, disadvantages, small capacity and short life. Nowadays, many high-end machines are equipped with them.

2. Traditional mechanical hard disks, which are often said to be inch hard disks used in ordinary desktops, also have small inches for notebooks, and smaller ones, which are generally seen in very small mobile hard disks and some **, audio** equipment.

There are two types: traditional HDDs and new SSDs.

There are two types of storage media for solid-state drives, one is to use flash memory (flash chip) as the storage medium, and the other is to use DRAM as the storage medium.

Flash-based solid-state drives (IDEflash disk, Serial ATA flash disk): use flash chips as the storage medium, which is also commonly known as SSD. Its appearance can be crafted in a variety of shapes, such as:

Laptop hard drives, micro hard drives, memory cards, USB flash drives, etc. The biggest advantage of this SSD is that it can be moved, and the data protection is not controlled by the power supply, it can be adapted to various environments, and it is suitable for individual users.

A few factors that affect the performance of an SSD are mainly:

Master chip, NAND flash media, and firmware. All things being equal, the type of interface used may also affect the performance of the SSD.

The mainstream interface is SATA (including 3GB S and 6GB S) interface, and there are also PCIe interface SSDs.

Due to the different design and data reading and writing principles between SSDs and ordinary disks, the internal structure of SSDs is also very different. Generally speaking, solid-state drives (SSDs) are simple to construct and can be detached; Therefore, most of the articles we usually see about SSD performance reviews are accompanied by internal disassembly diagrams of SSDs.

On the other hand, the data reading and writing of ordinary mechanical disks relies on the air flow generated by the high-speed rotation of the platter to hold up the magnetic head, so that the magnetic head is infinitely close to the disc, without contact, and the stepper motor pushes the magnetic head to read the lane change data. Therefore, its internal structure is relatively complex and precise, and it is generally not allowed to be disassembled. Once it is manually disassembled, it is highly likely to cause damage and the disk will not work properly.

That's why we don't see a disk removal diagram when evaluating a disk.

As long as the SSD is divided into IDE and SATA, the parallel port is IDE, and I haven't seen it on the market! SATA is serial, divided into SATA1 and SATA2, some of which are etc.! There are two types of storage media for so-called SSDs.

One is to use flash memory (flash chip) as the storage medium, and the other is to use DRAM as the storage medium.

The main differences between HDDs and SSDs are as follows:

1. Performance: The structure of solid-state drives and mechanical hard disks is completely different. SSDs boot up quickly and there are no motors to speed up the process of spinning.

2. The basic reading and writing principle is different: the solid state disk is read and written by bit, and the mechanical hard disk can be basically understood as sequential read and write, which is why the solid state disk does not need to be defragmented, and the mechanical hard disk must be defragmented once after a long time;

3. Different read and write speeds: SSDs have great advantages in transfer speed, up to 500m seconds, of which the read speed reaches 400-600m per second, and the write speed can also be as high as 200m per second. However, the read speed limit of traditional IDE hard disks cannot exceed 200M/s, and it is difficult for the write speed to exceed 100M/s, which is usually tens of M/s.

4. Data security: Puneng hard disk is to complete data reading and writing by reading the disc by the magnetic head, and the collision between the disc and the magnetic head is more likely to cause data damage during high-speed rotation, and it is easy to cause data loss due to the damage of the disc during transportation, while the solid state disk does not have a platter, so as long as the chip is not deformed by the shape extrusion, the data can be safely preserved;

5. Write times: SSD has a limit on the number of writes, that is to say, there is a life problem, the SLC main control SSD has 100,000 writes, while the MLC master used by the ordinary hard disk has only 10,000 write times, theoretically speaking, the SSD life will be shorter;

6. Data recovery: After the data on the SSD is deleted, it cannot be recovered with the help of software such as data recovery, while the traditional ordinary mechanical hard disk can be retrieved by some professional data recovery software, which is also a deficiency of the SSD.

Take Windows 10 as an example.

On the Windows 10 desktop, right-click on the computer icon and select the "Manage" menu item in the pop-up menu.

Now that the computer management window is open, click on the "Storage Disk Management" menu item on the left sidebar of the window.

After a while, the window on the right will show the disks contained in the hard disk, if there are two hard disks, one will be disk 0 and one will be disk 1.

Right-click on disk 0 and select the "Properties" menu item in the pop-up menu.

If the word SSD is displayed in the disk properties window that opens, then the drive is an SSD.

If there is no SSD in the disk properties, then the hard drive is not an SSD, but a mechanical hard drive.

As of April 2015, the vast majority of SSDs that have been put into practical use and marketed for ordinary consumers use SATA interfaces, followed by MSATA, NGFF, PCI-E and other interface types.

(a).SATA interface has high coverage because it is compatible with traditional HDDs. It should be reminded that the mainstream SSDs on the market currently use the interface below SATA2, and the speed cannot be fully exerted, so it is best to use the native SATA3 interface. SATA interface, as shown in the following figure:

(b).The mSATA interface, as the name suggests, is derived from SATA, has the interface specification proposed by the SATA Association, is suitable for miniaturized equipment, and has general development prospects, as shown in the following figure:

(c).NGFF interface, the interface standard proposed by Intel, is suitable for miniaturized devices, with high consistency in width and thickness, high interface versatility, large interface reserved bandwidth, and small development bottleneck, as shown in the following figure

(or Servant Four).PCI-E interface, large transmission bandwidth, small bottleneck in the development of code hall, has long been the standard configuration of enterprise-level SSDs, suitable for high-end and large-capacity enterprise-class SSDs, as shown in the following figure: