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What is the Difference Between U Disk and USB Flash?

Nowadays, more and more mobile storage devices appear in our vision. These mobile storage devices are very small and easy to carry around. Example would be U disk and USB flash (Pen Drive) which attract lots of people’s attention.

Though they are small, they are capable of holding a great deal of data. However, plenty of users are confused by the two items as both of them have similar shapes.

How to tell the difference between U disk and USB flash drive and make a choice? You need to know what U disk and USB flash drive are firstly. To get the detailed information, please keep reading the article.

What is U disk?

The U disk (also called USB hard disc drive) is a hard drive in USB form, which has magnetic hard drive platters spinning inside the enclosure. Each U disk has a bridge chip that can be used to manage the way that the drive is installed to the operating system.


Source: Flipkart

This chip converts the drive form from IDE protocols to USB. The cost of U disk production is cheap, but the sale price is the same as a standard flash memory USB drive.

What is USB Flash Drive?

USB flash drive is a data storage device that includes flash memory with integrated USB interface. Therefore, it enjoys many advantages such as fast speed, anti-magnetic, anti-shock, moisture-proof.


Since the USB flash drive is removable and rewritable, you can store your data continuously on it. If the drive is full, you are able to delete the previous data and then store the new data.

That’s basic information of U disk and USB flash drive. To look into the difference between U disk and USB flash drive, move on to the next part.

U disk vs USB Flash: Work Principle

The major difference between a U disk and USB flash is that a U disk uses spinning hard drive platters to store data, but a USB flash uses the more advanced flash memory.

Since USB flash doesn’t have moving parts like a U disk, it allows faster transfer speed, consumes less power, and is more durable.

Considering the advantages of flash memory and the price similarity between USB flash drive and U disks, USB flash drives are often a better choice than U disks for data storage and transfer.

To sum up, the details of U disk vs. pen drive are:

  • U disks use rotating disks to store data, but USB flash drives use flash memory.
  • U disks are less reliable against shock, pressure, and temperature.
  • U disks read and write data slower than USB flash drives.
  • U disks are cheaper to produce than USB flash drives.

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Sunil Pradhan

Hi there 👋 My name is Sunil and I'm a front-end developer who loves to help others by simplifying web-dev related topics.

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Sunil Pradhan

Hi there 👋 My name is Sunil and I'm a front-end developer who loves to help others by simplifying web-dev related topics.