Lots of clients have a query toward why I bur the USB drive,the capacity not full,is this a fake USB or bad one?
Today,we ask our engineers team to answers this questions below:
Firstly,we have to say this a normal phenomenon and meet the USB stdandards.Main reason is the Binary system and decimal system caused.
1.USB factory adopt binary system:
1TB=10^3 GB=1000G
1GB=10^3 MB=1000MB
1MB=10^3 KB=1000KB
1KB=10^3 Byte=1000Byte
2.Windows system adopt decimal system
1TB=2^10 GB=1024G
1GB=2^10 MB=1024MB
1MB=2^10 KB=1024KB
1KB=2^10 Byte=1024Byte
Based on this system,a 32GB drive actual size should be 32*1000/1024=31.25G,but in actual production process,different factory,the standard is little
various,in general,if the USB actual size above 90% of the labeling size is good product that meet the USB quality standards.
DBHpromo USB standards as below for reference:
Memory size & Actual available capacity
128MB >120MB
256MB >245MB
1GB >958MB
2GB >1.78GB
4GB >3.74GB
8GB >7.46GB
16GB >14.78GB
32GB >29.5GB
64GB >58GB
128GB >116GB
Usual speed(USB 2.0 port)
128MB to 16GB
Writte speed:>3-4MB/s Read speed:>10MB/s
32GB to 64GB
Writte speed:>6-8MB/s Read speed:>20MB/s
64GB to 128GB
Writte speed:>9MB/s Read speed:>25MB/s
Higer speed with little price than commnon standard,if have special requirements about actual capacity and speed,please
clarify to us before order confirmed.
From DBHPROMO Engineers' Team
