How many bytes does a 20GB hard drive represent? How do you plan the process?

A 20GB hard drive represents a capacity of about 20 billion bytes.

Solution: Hard disk manufacturers usually calculate in 1000 rounds

1gb=1000mb=1000*1000kb=1000*1000*1000b=1000000000b

Therefore: 20GB=20*100000000B=20000000000B<>

Calculation process.

1gb=1024mb

1mb=1024kb

1KB=1024bytes

So 20GB=20*1024*1024*1024byte=20*10 30byte=21474836480byte

Byte is a unit of measurement used by computer information technology to measure storage capacity and transmission capacity, and 1 byte is equal to 8-bit binary.

An array of any data type requires 20 bytes of memory space, plus 4 bytes per array dimension, plus the space occupied by the data itself. The amount of memory space occupied by the data can be calculated by multiplying the number of data objects by the size of each element. For example, a one-dimensional array of four 2-byte integer objects accounts for 8 bytes.

These 8 bytes, together with an additional 24 bytes, make the total memory space required for this array to be 32 bytes.

A 20GB hard disk has a capacity of about 20 billion bytes, and a 20GB hard disk capacity can be known according to the conversion formula "1GB=1000MB=1000*1000KB=1000*1030*10008".

20 Gigabytes (GB) = 21474836480 Bytes (B).

1gb=1024mb

1mb=1024kb

1KB=1024bytes

So 20GB=20*1024*1024*1024byte=20*10 30byte=21474836480byte

Advantages of SSDs:

1. Fast startup, fast read or write speed, small delay, relatively fixed read time. Because the addressing time is independent of where the data is stored, disk fragmentation does not affect the read time.

2. There is no mechanical motor and fan, and there will be no noise when working.

3. Low-capacity SSDs have low energy consumption and low heat generation in the working state, but the energy consumption of high-end or large-capacity products will be higher.

4. There are no moving parts inside, no mechanical failure will occur, and there is no fear of collision, impact and vibration. It does not affect normal use when moving at high speeds or even flipping and tilting, and minimizes the possibility of data loss in the event of accidental drops or collisions with hard objects.

5. The working temperature range is larger. A typical hard drive can only work in the range of 5 to 55 degrees Celsius. While most SSDs can operate at -10 to 70 degrees Celsius, or even a larger temperature range.

On the computer, it is generally converted to 1g=1024m, but the manufacturer generally converts it to 1g=1000m

So the size of 20g on the computer is 20*1000 1024= Of course, there will be fluctuations up and down according to the actual situation, I think more than 19g should be normal.

1TB hard disk capacity.

1099511627776 bytes (b). The amount of information stored is its main unit of measurement is bytes, and 1 byte is equal to 8 bits (b) binary. Binary digits (bits): Hold one-bit binary digits.

That is, 0 or 1, which is the smallest storage unit.

Sell 8 binary bits as one byte unit.

An English letter (regardless of case) occupies one byte of space, and a middle-aged Chinese character occupies two bytes. English punctuation occupies one byte, and Chinese punctuation occupies two bytes.

The algorithm of the storage manufacturer: 1TB = 1000GB, 1GB = 1000MB, etc

So 1TB = 1,000,000,000,000 bytes.

Of course, the number of bad sectors shielded by each hard disk is different when it leaves the factory, and the capacity will be different, not exactly the same.

1. Byte is a unit of measurement used by computer information technology to measure storage capacity and transmission capacity. In ASCII codes, an English letter (regardless of case and case) occupies one byte of space, and a Chinese character occupies two bytes of space.

2. Conversion of units:

TB = 1024GB (TB: trillion bytes, pronounced "TB" or "kilogi").

GB (1G) = 1024MB = 1024 trillion (GB: Gigabytes, can also be written as "G", read as "G" or "Gigabytes").

MB (1M) = 1024KB (MB: megabyte, can also be written as "m", read as "megabyte").

KB=1024B (KB: Thousand Sections, also written as "K", which can be read as "K B (bytes) = 8 bits (bits).")

Brand Model: Western Digital (WD).

System: WD10ezex

A 20GB hard drive represents a capacity of about 20 billion bytes.

The physical structure of the hard plate is generally composed of the magnetic head, the disc bending piece, the motor, the main control chip and the cable. When the main motor drives the platter to rotate, the auxiliary motor drives a group to the corresponding platter and determines whether to read the front or reverse disc surface, the magnetic head floats on the disc surface to draw a circular track that is slowly concentric with the platter, and then the magnetic inductance coil of the magnetic head induces the magnetism on the disc surface and uses the reading time or data interval specified by the hard disk manufacturer to locate the sector, so as to obtain the data content of the sector.

Most servers use SCSI hard disks with high data throughput and extremely low CPU usage. The external transmission rate and internal transmission rate of SCSI hard disk are much higher than that of ordinary hard disk, it generally adopts Ultra160 SCSI, Ultra320 SCSI and other standards, and the data transfer rate per second can reach 160MB and 320MB respectively, and the current mainstream SCSI hard disks use Ultra320SCSI standard.

1GB=1000MB=1000000KB=100000000B, so 10GB=10000MB=10000000KB=1000000000KB=1000000000B.

The gigabytes here are different from what we usually call "GB", which is actually "GB" (because Windows misuses GB as a unit of measurement for information, so it is displayed in Windows"1gb", in fact, it should mean"1gib", but windows shows as"1gb", which often leads to misunderstandings. ）

However, the difference in the conversion method between the two is often confusing. For example, the general hard disk manufacturer uses the base system of 1,000,000,000 (10) bytes = 1GB, due to the difference in the two conversion methods, the capacity is different in calculation, so it is common for the Windows system to report the capacity is smaller than the capacity indicated on the hard disk.

However, in Apple's OS X operating system, the capacity calculation method for storage devices is the same as that of hard disk manufacturers, which is 1GB = 1,000,000,000 (10) bytes in decimal, which avoids the trouble of calculation and use.