What is the Difference Between Flash Memory and a Hard Drive?

Flash memory (English: flash memory ), is a form of electronic erasable programmable read-only memory, which allows memory to be erased or written multiple times during operation. This technology is mainly used for general data storage, and for transferring data between computers and other digital products, such as memory cards and USB flash drives. Flash memory is a special type of EPROM that is erased in macroblocks. Early erasing of flash memory erased the entire chip.

Flash memory

Flash memory (English: flash memory ), is a form of electronic erasable programmable read-only memory, which allows memory to be erased or written multiple times during operation. This technology is mainly used for general data storage, and to exchange data between computers and other digital products, such as

Flash is a non-volatile

NOR-type and NAND-type flash memories are very different. For example, NOR-type flash memories are more like

To explain the principles of flash storage,

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If only from storage

1. what is usb2.0

usb 2.0 is a new version of usb technology. The transmission rate is up to 480mbps, which is 40 times that of USB1.1. Suitable for new high-speed peripherals. It inherits the usability of usb 1.1, plug-and-play, installation-free driver, and is fully compatible with usb1.1 standard. The usb1.1 equipment and cables you have purchased can still be used.

2. Know about USB:

USB1.1 flash disk read speed is generally 630KB, write speed is generally 520KB; USB2.0 read speed is generally 1.5MB, write speed is generally 1.0MB

The USB2.0 device is connected to the USB1.1 interface, but the USB2.0 effect cannot be exerted due to the speed limitation of USB1.1.

Using USB2.0 and USB1.1 devices at the same time, you can use USB2.0 devices in OS 9.x systems, but you must install drivers; however, these operating systems do not support USB2.0, the device can only Works in USB 1.1 mode

6. Can I run other applications while reading or writing to the flash drive?

can.

7. How many times can the flash disk be erased? How long can the data in the flash drive be kept?

Flash disk can be erased 1,000,000 times, and data in flash disk can be stored for 10 years

8. How many flash drives can a computer connect to at the same time?

In theory, a computer can connect 127 flash disks at the same time, but due to the alphabetical order of the drive letters and the existing drive requires several English letters, the flash drive can only connect up to 23 (except A, B, C) And need the assistance of USB HUB.

9. Can the flash disk be used in DOS state?

The flash disk supports WINDOWS virtual DOS mode (entered in the attachment after starting Windows).

10. Does the flash drive support Windows 95?

The flash drive does not support the Windows 95 operating system. It is recommended that users upgrade the operating system to Windows 98 or above.

11. How to use the flash disk under Windows NT4.0

12. Under what driver can the flash drive be used?

A9 Windows98, Windows ME, Windows 2000, Windows XP, Windows7, Windows8, Windows8.1, MAC OS, Linux.

13. Does the flash drive need a driver?

Not required on Mac OS, Windows 2000 and above, driver required on Win 98

14. Can the flash drive be formatted under Windows 98 / Windows 2000 / Mac OS?

can.

15. Can the contents of the flash drive be encrypted?

can.

16. Can the flash disk be shared in the local area network?

can.

17. What types of data can a flash drive store?

All computer data can be stored, including files, programs, images, music, multimedia, etc.

18. Do I need to shut down the computer when installing a flash drive?

No, the flash disk is a plug-and-play product that can be inserted and removed.

19. Is the flash drive waterproof?

Flash disks are electronic products, which may cause short circuit inside the flash disk and be damaged after being dropped into the water.

20. What precautions should be taken when inserting or removing a flash drive?

When the flash drive indicator flashes quickly, that is, the computer is in the state of reading and writing the flash drive, do not remove the flash drive; after inserting the flash drive, it is best not to remove it immediately. In particular, do not repeatedly plug and unplug quickly because the operating system requires a certain response time, and the interval between the best is more than 5 seconds.

21. Is the flash drive infected with a virus?

Flash drives, like all hard drives, can become infected

22. When the flash disk is used on a desktop computer, and the USB interface is behind the computer, is there any way to make it more convenient?

Connect to a computer via a USB adapter cable (with A-Type Plug and A-Type Receptacle)

23. What's the meaning of the saved LED light display?

When the LED is on, it indicates that the flash disk is successfully connected and no data is being transmitted. When the LED flashes, it indicates that the flash disk is in the process of data transmission.

24. Can the flash drive be pulled out while the flash drive's LED is still flashing?

No. It will cause data loss of the flash disk or damage the FAT table and a blue screen will appear. When the operating system reads the flash drive, it causes a blue screen on the computer.

25. The file on the flash disk is garbled or the file cannot be opened

Format using flash drive special tool

26. When double-clicking the flash drive letter, the computer prompts that the flash drive needs to be formatted

The above phenomenon occurs when the flash disk partition table is damaged or the flash disk performance is unstable. When this kind of problem occurs, you can generally use a special tool for flash disk to format

27. Flash disk write protection does not work. In the write-protected lock state, data can be written smoothly.

28. To switch the flash write protection switch, you need to disconnect the computer from the connection. If the write-protect switch is switched while connected to the computer, you need to re-plug the flash memory to make the switch work.

Magnetic random access memory

Both companies believe that MRAM will not only be an ideal replacement for flash memory, but also a strong contender for DRAM and SRAM. In June, Infineon launched its first product on the market. At the same time, Freescale is also stepping up research and development, and strive to launch 4M bit chips.

However, some commentators are concerned about whether MRAM can reach the size of flash memory cells. According to Infineon's report, the size of the flash memory cell is 0.1 & micro; m & sup2; while the 16M bit MRAM chip only reaches 1.42 & micro; m & sup2; In addition, the production cost of MRAM is not a small issue.

OUM

OUM (Ovonic Unified Memory Ovonyx standardized memory)

OUM is a thin film made by Intel, using compounds such as Ge, Sb and Te. OUM. OUM's write, delete, and read functions are similar to CD-RW and DVD-RW. However, CD / DVD uses lasers to heat and change materials called chalcogenides; while OUM uses a transistor to control the power supply to produce a phase change to store data.

The number of erasures of OUM is 10 to the power of 12 and the average data access time for 100 times is 200 nanoseconds. OUM is faster than flash. Although OUM has a slower data access time than MRAM, its low cost is a magic weapon for OUM to win.

Unlike MRAM, the development of OUM is still in its infancy. Although test chips have been made, they can only be used to confirm concepts and not to illustrate the feasibility of the technology. Intel has been committed to the research and development of OUM for the past four years and is working to expand this market.

Flash type U disk

to sum up

In addition to MRAM and OUM mentioned above, other alternative products are MRAM (FeRAM), Polymer memory (PFRAM), PCRAM, Conductive Bridge RAM (CBRAM), Organic RAM (ORAM), and most recently Nanotube RAM (NRAM) . There are many alternatives to flash memory, but it is doubtful which way and when.

For most companies, flash memory is still an ideal investment. Many companies have decided to increase their investment in flash memory. In addition, it is estimated that by 2004, the total output value of flash memory will go hand in hand with DRAM, and by 2006 it will surpass DRAM products.