What is a u disk?

An U Disc, also USB Hard Disc Drive, is a data storage device used for storing and retrieving digital information using one or more rigid (“hard”) rapidly rotating disks (platters) coated with magnetic material. U Disk is an external drive that has an actual harddrive inside and therefore can store more data.

U Disk

What is USB Flash Drive?
A USB flash drive, also known under a variety of other names,[a] is a data storage device that includes flash memory with an integrated USB interface. USB flash drives are typically removable and rewritable, and physically much smaller than an optical disc. USB flash drives are often used for the same purposes for which floppy disks or CDs were used, i.e., for storage, data back-up and transfer of computer files.

Difference between U Disc and USB Flash Drive
An U Disc is bigger than USB Flash Drive while Flash drives are normally faster than actual harddrives because there are no moving(or spinning) parts involved which significantly increases access times.

As a point to remember: if your USB flash drive mounts as a UDISK on your computer, it means it’s a bad USB drive with firmware that doesn’t match the memory type and controller combination. The drive is saying it’s using flash memory, when in reality it’s just a small hard drive. Without the correct firmware in the controller, the USB stick is unstable and the operating system tips users about the problem by calling it a UDISK.
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