You Frequently Ask Questions while using USB Flash drives


1,How much data can USB flash drives hold?

We assume the photo average size is 2MB, songs in size of 3MB, and the film is 500MB. How much data Your USB drives can hold? Here I list Sino-memory's USB drives capacity for your reference.

1GB USB Flash Drive has 1013MB  (0.99GB) available for user storage.It means you can store:
  • 506 photos:
  • or 337 MP3s:
  • or 2.02 films in Mpeg format
2GB USB Flash Drive has 1894MB (1.85GB) available for user storage, Which means you can store:
  • 947 photos:
  • or 631 MP3s:
  • or 3.78 films in Mpeg format
4GB USB Flash Drive has 3829MB (3.74GB) available for user storage, Which means you can store:
  • 1914 photos:
  • or 1276 MP3s:
  • or 7.65 films in Mpeg format
8GB USB Flash Drive has 7659MB (7.48GB) available for user storage, Which means you can store:
  • 3829.5 photos:
  • or 2553 MP3s:
  • or 15.31 films in Mpeg format
16GB USB Flash Drive has 15564MB (15.2GB) available for user storage, Which means you can store:
  • 7782 photos:
  • or 5188 MP3s:
  • or 31.12 films in Mpeg format
32GB USB Flash Drive has 29798MB (29.1GB) available for user storage, and This means you can store:
  • 14899 photos:
  • or 9932 MP3s:
  • or 59.59 films in Mpeg format
64GB USB Flash Drive has 59904MB  (58.5GB) available for user storage. This means you can store:
  • 29952 photos:
  • or 19968 MP3s:
  • or 119.8 films in Mpeg format

We can see that the working space for USB drives is not total. Why this? 

1. It is because firmware essential needs space for operation. So it takes some space out.
2. There are two systems decimal and binary.When the decimal is used, 1 GB = 1000MB; when the binary conversion method is used, 1 GB = 1024MB. 

In general, manufacturers use the decimal for calculation, while the system uses binary in a computer.

In this way, the actual capacity of the USB disk recognized by the computer is less than the nominal capacity of the USB disk manufacturer. 

For example, the calculation 128GB capacity is as follows.

Since the minimum unit of storage is Byte, the translation to the manufacturer is 1KB = 1000bytes, 1MB = 1000kb, 1GB = 1000MB,

So here's how 128G's capacity is calculated for the manufacturer:

128G = 128 * 1000 * 1000 * 1000(Bytes) .

For computer systems, 1KB = 1024bytes, 1MB = 1024kb, 1GB = 1024MB, so in computer systems, the system conversion is: 128 * 1000 * 1000 * 1024/1024/1024 = 119.2093G

Here is screenshoot of 128GB capacity that is available for use.

Apparently, computer systems show that the USB stick has less storage capacity than the standard storage that the manufacturers use on their products.

3. The above is still a theoretical value. The U disk itself will also have some inherent flash disk file system occupied storage space, such as the FAT file system. It includes the MBR master boot partition, FAT file allocation table, ROOT directory area, etc. 

But this occupies relatively tiny storage space, usually tens of hundreds of KB.

In addition, FLASH FLASH memory chip particles may have a specific Bad Block (Bad Block). As long as these blocks are in a reasonable range, the U disk is also a qualified product. 

The Bad block can not use, and they are "ignored" or "overwritten" by the master and are not calculated into storage capacity.

Because of the three reasons, the actual capacity calculated by computer equipment may be slightly lower than the theoretical conversion value.

At last, The default "industry standard" is working capacity is not less than 93% of the capacity of the total chip is acceptable. Leave your comments on the capacity of USB drives? Let's negotiate together.

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