By PURPLELEC | 26 September 2023 | 0 Comments
The difference between flash memory and hard disk
Flash Memory is a long-life non-volatile memory that can retain stored data information even when the power is off. Data is deleted not in units of single bytes, but in fixed areas. The unit is block (Note: NOR Flash is byte storage.), and the block size is generally 256KB to 20MB.
Flash memory is a variant of electronically erasable read-only memory (EEPROM). The difference between flash memory and EEPROM is that EEPROM can be deleted and rewritten at the byte level instead of erasing the entire chip. Most chips of flash memory require block erasing. remove. Because it can still save data when the power is off, flash memory is usually used to save setup information, such as saving data in a computer's BIOS (basic program), PDA (personal digital assistant), digital camera, etc.
The difference between flash memory and hard disk
advantage
1. Flash memory is small in size. This does not mean that the integration level of flash memory will necessarily be high. The main reason why micro hard drives are so big is that micro hard drives cannot be made smaller than flash memory. This does not mean that micro hard drives are not highly integrated.
2. Compared with hard disks, the flash memory structure is not afraid of shocks and is more resistant to drops. What the hard drive fears most is strong vibrations. Although we can be careful when using it, tigers also take a nap sometimes.
3． Flash memory can provide faster data reading speeds, while hard drives are limited by rotation speed.
4. Flash memory is more secure for storing data for several reasons:
(1) It has a non-mechanical structure, so movement will not affect its reading and writing;
(2) The service life of widely used mechanical hard disks is closely related to the number of reads and writes and the read and write speed, while flash memory is not affected much;
(3) Hard disk writing relies on magnetism, while flash memory uses voltage, and data will not be erased over time.
5. Lighter mass.
shortcoming
1. The materials are expensive, so the unit capacity is more expensive.
2. The reading and writing speed is relatively slow.
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