Sector refers to a specific area on the physical disk, while the term block only refers to a unit of data.
You may see black and sector being used interchangeably, but it’s important to note the difference between the two. A single block typically holds 512 bytes of data. It is the smallest unit of information that can be read or written from the disk, consisting of multiple bits (binary digits). What is a hard drive blockĪ hard drive block is a unit of data storage on a hard disk. Fortunately, you can fix bad blocks on hard drives in Windows 10 with the help of disk utility software such as CHKDSK, a Windows built-in bad sector repair tool, or a third-party application. Bad blocks on hard drives can be a major cause of data loss and system instability.
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