If you have a Mac, you don’t need to worry at all. In short – if you’re using a Windows PC with Windows 7 onwards, you don’t need to worry about defragging your hard drive. The APFS file system introduced with the High Sierra operating system in 2017 streamlined this process further. The HFS+ file system, first introduced in 1998, used a process called Hot File Clustering to defrag files on the fly in 2003, Hot File Adaptive Clustering made this process more efficient. The filesystems that Macs use – HFS+ and APFS – prevent fragmentation, and automatically defrags if it is necessary. SSDs are not electromechanical devices, and data is stored on NAND flash chips they are able to read blocks of data quickly regardless of whether they are adjacent to one another. With solid-state drives (SSDs), there are no circumstances where defragging is necessary. Data storage technology has evolved over the years, and starting with Windows 7, hard drives are automatically defragged, so it doesn’t need to be done manually.

But is it necessary to defrag your hard drive? It depends. The idea behind defragmenting – or defragging – is simple if the data blocks are located close together, they will be able to be accessed quicker, and read times will be improved. The more you use a hard disk drive, continuously adding and deleting files, the more difficult it becomes for the drive to store data efficiently. Data being stored on sequential sectors on the disk ensures that the heads move as little as possible, speeding up read times. If the read/write heads have to access multiple sectors in order to read a file, then read times will be slower. Defragging has traditionally been used to speed up drives – but how necessary is it today?Įlectromechanical hard disk drives store data in chunks, known as sectors, and a single file may be spread over several. Over time, a hard drive may begin to slow down and operate with less efficiency.

How to defrag external hard drive mac