Standard of USB Speed,Actual Available Capacity from DBHpromo

 So many clients confused that what is the basic standards for a specific USB capacity about the write,read speed,controller,chips brand and actual available capacity,today we state our basic standard for clients 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.

Controller:Chipsbank,Alcor (frequently adopt),SIM,PHISON(the last two usually apply to USB3.0)
Chips:Samsung/Toshiba/Micron/Sandisk/Hynix (will adopt one the name brand based on stocking)

If you have special about the USB speed,controller,chips brand,please clarify before confirm order to us,otherwise our factory will produce based on market stock.

More query or interest,please write email to us info@dbhpromo.com

Basic Knowledge Of USB Drive Easily Neglect By People

There are still some clients still could not get very familiar with USB combination,today DBH promo engineers team present some basic knowledge about USB Flash Drive.

A USB Stick usually made of housing case,Nand Flash,PCBA and some components and parts.The most important part of USB is Nand Flash,which occupy most cost of a finished USB drive,which responsible for store data.The flash market price greatly affect the USB price finally.

Flash at moment DBHpromo usually adopt Samsung,Sandisk,Micron,Toshiba,Hynix name brand,in actual production,we will adopt one of the chip types based on inventory.

Flash is divided into two types,one is SLC(Single Level Cell) and MLC(Multi-Level Cell),let's see what is difference between this:
Theoretical lifetime:SLC  100k times plug and play,MLC is 10K times
Speed:Usually the same capacity,SLC is faster than MLC
Power Consumption:Under same condition,SLC is lower than MLC
From oversee,the MLC not seems good than SLC,but unit cell store MLC have absolute advantage than SLC,recent years so many chip factory greatly improved the con-structure of MLC,the whole performance seems better and better.

  Another important information is about the controller of the USB,main have Chipsbank,Alcor,SMI,PHISON,Usbest etc,
SMI and PHISON belongs to USB3.0 usually do,2.0 usually adopt Alcor and chipsbank.

Usually if clients need to specific controller and chips,the cost will increase,because this add the time to find the chips matching the controller.

More industry news or query,feel free to contact dbhpromo.com.

Why a 32GB USB drive memory size NOT have 32GB size ??

Recently 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.More info feel free to visit our website www.dbhpromo.com