Since blocks are the location in which your data is physically written to the disk, when you receive a warning about a bad block it is an indication that you have some physical damage on your drive. Potentially, if you had a document that was written across multiple pages or blocks, you would only lose the segment of data that was on the single damaged page or block. Continuing with this analogy, if one of the pieces of paper was damaged you would no longer be able to read the data on the single piece of paper. To give an easier representation of what a block is, if you imagine your hard drive is a filing cabinet, the individual drawers are going to be your partitions, and the individual pieces of paper in the drawer are the block or sectors that your data is physically stored on. A standard block is going to be 512 to 4,000 bytes depending on your drive, and a 1TB hard drive will hold around 21,474,83,648 blocks. A block or a sector is a unit of measurement used to break up your hard drive. One of the most common symptoms of a failing hard drive are bad blocks, also known as bad sectors. How To Find Bad Blocks On A Mac Hard Drive MaWhat Is A Block?
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