The WD WD400JD-75HKA1 internal hard drive works as an ultimate solution for your storage and backup requirements. The storage capacity of 40 GB makes it easy for you to store your everyday files in this Western Digital HDD. With a speed of 7200 RPM, this internal hard drive reads your files quickly for faster performance. Further, this Western Digital HDD offers quiet and cool operation avoiding any kind of discomfort while working. This cool operation is maintained even in scorching environments. Using the WhisperDrive technology, the WD WD400JD-75HKA1 reduces the noise levels to zero to benefit human hearing.