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USB large volume storage device

A large-capacity storage and large-capacity storage technology, which is applied in the field of USB mass storage devices, can solve the problems of control writing software, data destruction of U disk, incomplete support of U disk, etc.

Inactive Publication Date: 2005-03-02
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some manufacturers’ U disks only support their own formatting operations; some manufacturers’ U disks do not fully support WINDOWS98 / 2X’s FAT, FAT32, NTFS formatting operations; and some manufacturers’ U disk data are often destroyed for no reason; In addition, there is also the problem of insufficient longevity
The reason is that there is a problem with the control writing software

Method used

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  • USB large volume storage device
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Embodiment Construction

[0016] The present invention will be described in detail below by means of embodiments and accompanying drawings.

[0017] figure 1 The shown USB interface and power generator circuit provides a USB interface with the USB communication circuit, and derives a power supply of about 3.3 volts from the USB power supply for the rest of the circuits to work. J1 is a USB socket, the 1st pin is the USB ground, the 2nd pin is the USB data line DP, the 3rd pin is the USB data line DN, and the 4th pin is the USB 5V power line. D2, D3 are two silicon diodes 1N4007, D1 is a germanium diode AK15. Three diodes are connected in series, as shown in the figure, connected between pin 4 of J1 and signal V3.3. The voltage drop of the three diodes is about 0.65*2+0.3=1.6 volts. Starting from the 4-pin 5-volt power supply, V3.3 is about 3.4 volts, which is used to drive the rest of the circuit. We choose the rest of the components so that they operate between 2.7 volts and 3.6 volts. The functi...

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Abstract

The invention is a high-capacity USB memory, composed of hardware and software, where the hardware adopts universal devices and is composed of USB interface device, low-cost high speed PIC compatible MCU, and high-capacity memory chip. Its disadvantage is somewhat complex to connect but its advantage is multiple combination possibility and large select space. The invention gives a detailed software solution, and advances a special 'backup-direct write-recover' write flow based on the character of block erase and page copy of the high-capacity memory chip, thus assuring it has the characters of long service life, permanent accuracy and strong compatibility and making the made USB disc have the advantages of being easy to upgrade and performance reliability.

Description

technical field [0001] The invention belongs to the technical field of computer storage devices, and in particular relates to a USB large-capacity storage device (U disk for short). Background technique [0002] As an auxiliary tool for computers, floppy disks have been gradually replaced by U disks due to their shortcomings such as small capacity, slow speed, and short life. The biggest feature of U disk different from floppy disk is that there is no mechanical part, so it can achieve fast speed, large capacity, long service life, and safe and reliable data. [0003] The U disk is generally composed of a dedicated control chip and a large-capacity storage chip. The advantage of this solution is that manufacturers can directly produce and process according to the drawings provided by the dedicated control chip supplier. However, some manufacturers’ U disks only support their own formatting operations; some manufacturers’ U disks do not fully support WINDOWS98 / 2X’s FAT, FAT...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11C16/02
Inventor 张德志
Owner FUDAN UNIV