If you are first time to purchase USB product, you will be very strange when you get price list so low but so high sometime. How can you choose the right one? Who are the liar and cheater? Let us begin from product knowledge.
If you have a little common sense you will know there are two most important specifications about storage product. One is capacity of save data without error. The other is speed of copy data.
The real capacity is not easy to know from common sense, because sometime you will be cheated when you use it. Let’s realize the concept of Upgrade USB or Upgrade card. For example, one USB stick upgrade form 1GB to 32GB, it means that it looks like normal 32GB, and it shows
as the same as 32GB. And if you input data, it also can accept closely 32GB data; however, it just has 1GB data without error. It means the other data will lost in your stick.
Take an example about 4GB; one is Real capacity 4GB, as follow:
If you want to know the real capacity, you need to use the “H2test” to find out how much real capacity it is.
How to use “H2test”? Before you test one USB s tick, backup your data then format the stick:
Select “Quick Format”:
Secondly, use “H2test” to test the real capacity:
Open “H2test”, choose language:
When it finish the test, it shows result: you can see “Without errors”, it means this disk have a full real capacity, when you store 3892MB (closely 4GB, because profile occupy a little space), all data can be used normally without any error. At the same time you can see the Writing speed and Verifying (Reading) speed.
Let’s test an Upgrade USB too. It upgrades from 128MB to 4GB, we can see the result (the same operate orders):
Format it firstly:
The result is:
You can see it just has 128MB (even less than 128MB, only 117.7MB) data without errors. The rest data lost; it means that you can copy the data into the disk but it will come out error (you can’t use this data correctly) or it will lost at last. However, you see it has 3.9GB when you insert it into computer, it also can put 3.9GB data into it. So only you use this data, or you will never find out the truth. Now let’s figure out the fact of speed.
Speed of copy data has two speeds: writing speed and reading speed.
Writing speed means data copy into USB flash drive. The speed is its writing speed. Reading speed means data copy out from USB flash drive. The definition is the same as memory card and other storage product. It’s easy to know the general speed: copy one movie into USB disk, count the seconds, you can know how fast the writing speed is. Also, copy out one movie from USB disk into computer hard disk, count the time you will know the reading speed of USB disk. It’s not hard to know, the reading speed usually faster than writing speed. You can learn it from your daily experience. If you will know the ex act speed, download “H2test” software from internet, then you will know the result.
If you just want to test the speed, you have no need to test all data volume, it cost too much time. Just use 50MB or 100MB is enough, as follows:
The result:
In fact, not only the chips and the program solution decide the speed, the connector and the data circuit line also influence the speed, take a example to test 128GB 3.0 USB flash drive. If you use a USB 2.0 connector (old computer connector is USB 2.0), the speed will be:
But use the USB 3.0 connector (New version computer has USB 3.0
Connector), its speed is:
These two tests use the same chip and the same program solution. You can see the results have too much difference.
At last, when you know the two important specifications, how do you know the price is reasonable or not? It is easy to figure out the way.
Visit official website to reference the price: www.chinaflashmarket.com
You can visit the price what you need, for instance Micro SD card:
If you need more info, please click “More”; the same as USB:
Please pay attention to the USB module, it is not USB end-product, it just half product. The USB module inst alls cover then it will be USB end-product. So the price of USB end-product is higher that USB module.
If someone give you an unbelievable low price just like 1$ or 1.5$, I think you can pass them. They must be cheater and liar.
But we certainly hope to find a good price and good quality, how should we do？
At first you can compare the quality, test the goods. If the quality is good, you can compare the price. Of course, if you can visit the suppliers and pay by the guarantee of a third party, you can get less risky.
If you purchase step by step as we said, we can not promise you get a best price 100 percent, but we can promise you will get good quality product.
At last, please allow me to introduce our company who is a professional manufacturer in USB and powerbank (New series of USB products offered, such as Smartphone Udisk, PCDatakey. Also AFdisk, Padisk developed and private supplied by us). Welcome to visit us and our website:
We may be not the biggest producer, but we will give you the best quality with best prices and best services. Besides, the most potential development in world market with the following coming out of new series products. Hope we can help your esteemed company in business expansion, start a long-term business and make us win-win.
