Consumers Association revealed that shrinking U disk is not common sense: wrong statistics

"This is not to mention shrinking, 8GB is written on the packaging, this B is byte. And the capacity displayed in the computer is converted into the number of commonly called G, each level conversion is 1024-bit, and It's not a 1000-carry. In fact, the capacity is enough, but only with another conversion method, it shows the difference." A brand-name U disk, flash memory card agents said.

The day before yesterday, the Beijing Consumers Association released a message that the 30 USB flash drives that were sampled were all in the virtual standard capacity.

However, some netizens believe that because the hard disk, U disk and other storage media conversion unit is 1024 instead of 1000, after the conversion from the nominal value of some gap, "How do Consumers Association do not even know this?"

The Association found that 30 kinds of U-disks were not up to standard. According to the results announced by the Consumers Association, 30 kinds of 8GB U-disks were spot-checked. “Flash memory manufacturers generally misrepresent the capacity and mislead consumers.” The specific results show that the vast majority of products in the survey sample have a capacity of 93% to 94% of the nominal value of 8GB. No one product reaches 100%. "If the nominal 32GB product reaches 28.8GB, it meets the requirements. The test data shows that 17 sample capacity accuracy is below 93%, and only 3 samples have an accuracy rate of 98%. The highest and lowest accuracy of the sample's capacity. The gap between them reached 7%.” However, Consumers Association also admitted that according to the current national standards, the conditions of these products are in line with the standard, but the national standard for the capacity difference of 10% is the provisions of qualified products, "provided for producers to lower product standards Protection."

In addition, Consumer Association also proposed that storage cards read and write speeds are different, and they lack the express instructions on the packaging.

The agent responded that the accusation was purely comical. “I can only say that this is a very basic common sense.” The reporter contacted a Beijing-brand sales agent of a brand-name storage product. The person in charge introduced the nominal GB on the hard disk. Means G bytes, the byte's hexadecimal is 2 to the 8th power, which is 1024. In other words, 1KB = 1024B, 1MB = 1024KB, and 1GB = 1024MB. The nominal 8GB U disk should have an actual capacity of 8,000,000,000 bytes. "The number of bytes divided by three times 1024 results in a number of gigabytes." According to this calculation, the result is about 7.45 GB, which is exactly 93% of the nominal value.

"This is really a true 8GB. Does it mean that manufacturers are going to sell U-disks with 7.45GB? The more numbers, the more unfavorable consumer acceptance." The reason for this phenomenon is that "the growth of computer product capacity is going with time." The earliest computers used were dozens of kilobytes of disk, and 720KB of floppy disks were used by many people. Although the capacity of storage media is large, computers always measure capacity in binary format, so each level of conversion will There is a difference. Including hard drives, there is this phenomenon." As for the association's release results, it is called "misleading". "There is no need for manufacturers to do this. If it is enforced, everyone will call 7.45GB. Nobody loses, and no one loses. This is just a traditional way of computing."

As for the speed of reading and writing proposed by Consumers Association, according to the agent, there are many softwares currently testing the speed of memory cards. “This is very easy to test, as long as it is known, many products will also be classified with the same capacity. As long as a brand buys genuine goods, under the same capacity, the more expensive it is to read and write, the faster it will be. Whether or not a specific value is specified, the quality of the market will ultimately determine the price of the product.”