Data storage has advanced and seen tremendous change over the years, from large magnetic tape drives with little storage capacity to compact universal serial bus (USB) flash drives with extensive storage capacities of up to 1 terabyte.
While it is highly likely that everyone knows at least something about USB flash drives, there is more to USB flash drives than meets the eyes.
This article answers four frequently asked questions about the USB flash drive. It will guide end-users to understand how these storage devices work and their data storage and transfer capability, among others.
There is more to USB flash drives than meets the eye Source: Daniel CHETRONI/Adobe Stock
What is a USB flash drive, and how does it differ from conventional data storage devices?
USB flash drives are small plug-and-play portable storage devices that include flash memory with an integrated USB interface. These devices are supported by pretty much all operating systems and BIOS and are able to store (and) transfer data at a faster rate than floppy disks and optical disks.
Flash drives simply allow users to edit, write or delete files after they have been accessed on a PC. In addition, they have no moving parts, making them more durable and capable of withstanding mechanical shock than hard disk drives (HDDs).
What is the data transfer rate of a flash drive?
Data transfer rate tells how much digital data is being transferred from the computer to the flash drive (or vice versa) within a given period. It is typically measured in bits per second (or bps) or bytes/sec (Bps).
Bits are typically used when measuring the speed of a connection, while bytes are used for measuring the size of data. Nevertheless, end-users can calculate data transfer rate (in Bps) given the transfer speed (in bps) using the following equation:
Simply put, there are 8 bits in 1 byte.
Why do USB flash drives show less storage capacity than the product described?
This is another commonly asked question among end-users of flash drives. For instance, when a 16 GB flash drive is plugged into a PC, it typically displays 14.8 GB of available storage space.
The major reason for this difference is due to the way PC manufacturers and storage manufacturers define a scale. Most computer manufacturers use the binary system, while storage device manufacturers use the decimal system. For instance, 1 kilobyte is equivalent to 210 (or 1,024 bytes) in the binary system and 103 (or 1,000 bytes) in the decimal system, causing a difference of up to 2%.
In addition, when a flash drive is formatted, some of its storage capacity is allocated for boot data and file systems. Therefore, this can cause some of the storage capacity to be unavailable to the user.
What is the difference between USB 1.0, 2.0 and 3.0?
USB 1.0, 2.0 and 3.0 describe three different versions (or generations) of the USB drives. And the major difference between these versions is in their data transfer speed. The first USB generation (USB 1.0) has a transfer rate of up to 12 Mbps (pronounced 12 Megabits per second), while USB 2.0 and 3.0 have data transfer rates of up to 5 Gbps and 10 Gbps, respectively.
In addition, the newer generation USB 3.0 allows data transfer in both directions at a time, whereas USB 2.0 (and older generations) can only process data in a single direction over a single circuit. This is because USB 3.0 uses the full-duplex data transmission method, whereas older generations utilize the half-duplex data transmission method.
Nevertheless, USBs are designed to have backward compatibility, meaning end-users can utilize a USB 1.0 device on a 3.0 spot. But keep in mind that the data transfer speed advantage of a 3.0 spot will not be felt when using a USB 1.0 device.
Conclusion
USB flash drives are important storage devices that can be used in a broad range of applications today. However, they come in different designs, with different storage sizes and data transfer capabilities. The right choice primarily depends on the end users’ intended usage.
