Disassembling a 32G USB flash drive

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Disassembling a 32G USB flash drive [Copy link]

 

DIY&Share—GravityShare

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USB flash disk has become one of the most frequently used devices around computers due to its small size, large storage capacity, low price and reliable performance.

USB flash disk, the full name of which is USB flash drive, is also known as "USB flash disk". It is a micro high-capacity mobile storage product that uses a USB interface and does not require a physical drive. It is connected to a computer through a USB interface to achieve plug-and-play.

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This time we disassembled a 32G USB flash disk to explore its internal components.

G01

G02

P01 32G U disk

Play the following video to watch the most direct disassembly process:

V01 Production process

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Graphic part↓

1. Disassembly preparation 1, Material and tool preparation

1. USB flash drive (32G) 1 pc

2. Utility knife 1 3. Other tools, etc.

http://imgal.xmyeditor.com/uploads/1098/1097850/20190509/5cd4075d2408dyxxypprbzwthumb.jpg [/img]

P02 Disassembly Protagonist

2. Disassembly Process Sharing Remove the cover of the USB disk. Since the plastic shell is fixed by ultrasonic welding, use a utility knife to cut a gap around the shell: P03 Remove the cap For this ultrasonic welding method, the advantages are fast welding speed, high welding strength and good sealing, but the disadvantages are: one-time welding, subsequent troubles such as opening the cover for maintenance, and it is difficult to re-fix after disassembly:

P04 Remove the cover

Take out the circuit board, the volume is very small, and the thickness of the circuit board is small:

P05 Take out the board

There are two IC chips on the top layer of the PCB, one is the main controller and the other is the flash memory chip:

P06 Top layer

There is also a flash memory chip and a patch LED indicator light on the bottom of the PCB: P07 Bottom layer Use a magnifying glass to look at the silk screen information on the surface of the chip: P08 Enlarge The controller chip is UP23N: P09 UP23N. There is no silkscreen on the flash memory chip. It is probably 16G NAND Flash chip: http://imgal.xmyeditor.com/uploads/1098/1097850/20190509/5cd4077f52a40knxauxrthvthumb.jpg.P10 Top Flash Layer: Red SMD LED on the bottom layer: http://imgal.xmyeditor.com/uploads/1098/1097850/20190509/5cd40788caeb7lyyplssnhrthumb.jpg P11 LED: There is white silk screen on the flash memory chip, but no information can be seen:

P12 bottom layer Flash

The disassembly ends here:

P13 disassembly is completed

Finally, let’s take a group photo:

P14 Disassembly photo

III. Disassembly principle analysis

Since the signal of the flash chip cannot be seen, the chip application schematic diagram of UP23N is found on the Internet. The general design direction is: main controller + Flash chip:

P15 UP23N application principle (from the Internet)

Fourth, the final words

The overall design of the 32G USB flash drive disassembled this time is: the main control chip UP23N + two Flash (16G) chips, plus a small number of peripheral components and LED indicators. The direct size of the USB flash drive capacity depends on the size of the Flash chip, so the larger the capacity, the higher the price.

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