About the problem of flash memory products test speed
All the flash memory products marking are from the official data, we can ensure that quality goods , computer hardware configuration, card reader is good or not, at the same time to test whether the other software, these will influence the test results, and don't accept and speed the problem about the refund, thank you for your understanding.
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Questions and Answers:
Why actual capacity is smaller than indicate the capacity ?
Before you purchase hard disk, usb flash drive or flash memory card after, careful you will find that, in the operation system of hard disk, usb flash disk or flash memory card capacity and official nominal capacity discrepancy, are less than nominal capacity, capacity is larger, the difference is this. Nominal 40 gb, in operating systems show only 38 gb, 80 gb hard drive only have 75 gb, and 120 gb of a hard disk is only 114 gb, this is not the manufacturer or distributor shoddy cheat consumption person, but hard disk vendors to capacity calculation method and the calculation method of operating system caused by the different, different unit conversion relation of cause.
As is known to all, in computer use binary, such cause in the operation system of capacity calculation is every 1024 for a into system, every 1024 bytes for 1 KB, every 1024 KB to 1 MB and 1024 MB per 1 gb, every 1024 gb 1 TB, and hard disk vendors in the calculation of the capacity in every 1000 is for a into system, every 1000 bytes for 1 KB, every 1000 KB to 1 MB, every 1000 KB to 1 MB and 1000 MB per 1 gb, every 1000 gb 1 TB, the binary of the bad different caused flash class capacity "shrink".
With 8 GB of U disk, for example: manufacturers capacity calculation method: 8 GB = 8000000 KB = 8000000000 bytes, conversion into operating system calculation methods: 8000000000 word day / 1024/1024/1024 = 7.450580596923828125 GB hard drive, need to partition and formatting, operating system differences, plus installation operation system copy file behavior, hard disk will be tied up more space, so the operating system shows that the hard disk capacity and nominal capacity differences, so practical capacity is nominal capacity between 90% - 93% is normal.
Storage manufacturers generally the decimal:
1 TB = 10 * 3 GB = 1000 GB
1 gb = 10 * 3 MB = 1000 MB
1 MB = 10 * 3 KB = 1000 KB
1 KB = 10 * 3 Byte = 1000 Byte
Windows operating system USES binary:
1 TB = 2 * 10 GB = 1024 GB
1 gb = 2 * 10 MB = 1024 MB
1 MB = 2 * 10 KB = 1024 KB
1 KB = 2 * 10 Byte = 1024 Byte
Because the algorithm is not consistent, lead to storage products of nominal capacity and practical capacity appear error, the greater the capacity, capacity "loss" is bigger, eventually lead to 3 TB large capacity hard disk in the Windows operating system display 2.72 TB.
According to the "information technology mobile storage usb flash disk general standard" regulation: "product actual can use capacity is equal to or greater than 90% of the indicate capacity"
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