[TOPIC] Learn how to connect an HDD or an SSD via USB

When adding an HDD or SSD to your PC, there are roughly two ways: “direct connection” and “USB connection”. Many desktop PCs have a place to fix an HDD or SSD to be added inside, in which case the HDD or SSD can be directly connected. However, since it is necessary to open the case and screw it in, it is easy and recommended to connect with USB regardless of whether it is a desktop PC or notebook PC. Also, if you use an HDD or SSD case, you can easily connect an internal HDD and SSD via USB. It is also convenient when you want to remove the HDD of the PC you used before and transfer the data to a new PC. This content explains each USB connection method and features.


  1. 1. When connecting an external HDD via USB
  2. 2. When connecting an external SSD via USB
  3. 3. When connecting an internal HDD or SSD via USB
  4. 4. Conclusion

・1. When connecting an external HDD via USB
Basically, an external HDD can be accessed from “My Computer” (displayed on a computer or PC, depending on an OS) as it is because a drive is automatically read and recognized just by inserting it into an USB port. Depending on HDDs, there are those that have already been formatted at the time of purchase and those that have not been formatted. When connecting a newly purchased external hard drive, if the drive is not recognized, it is better to check from the device management.

・2. When connecting an external SSD via USB
Since the function of an external SSD is basically the same as an external HDD, you can use it just by inserting it into the USB port of your PC. Since SSDs do not have moving parts of motors, these are relatively resistant to vibration and shock, read and write faster, and need lower power consumption, compared to HDDs.

・3. When connecting an internal HDD or SSD via USB
In order to connect an HDD or SSD built into the PC via USB, it is necessary to know the size of them. HDD sizes are roughly divided into two types, 3.5 inches and 2.5 inches, and cases corresponding to each are commercially available, so first purchase a case that fits the size.
Regarding connection standard, the standard called IDE was used before, however now the standard called SATA is the mainstream. Therefore, in most cases, there is no problem in choosing a SATA type. SSDs are small in size and basically can be stored in a 2.5-inch case, though you need to confirm connection standards since there are several types. You can buy any size case for a few thousand yen, although the 2.5-inch one is a little cheaper. If your PC supports, you can purchase a USB3.0 one and the transfer speed may become quite faster.
If your PC is out of order and you need to extract data, or if you want to transfer data from your old PC to a new one, remove an HDD or SSD from your PC and connect it via USB as an external storage. In this case as well, you can use it in the same way as a normal external HDD by installing the removed HDD or SSD in the case and recognizing it with a USB connection. Since some USB connection cases and adapters can be used for various types regardless of size or connection type, purchase this if you frequently connect an internal HDD or SSD via USB.

・4. Conclusion
An HDD and SSD can be used very easily by connecting with USB. If you purchase a commercially available drive for USB connection, you just can connect it, or if you use a case for external connection, you can also connect the internal one with USB.

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