PMR (Perpendicular Magnetic Recording) and SMR (Shingled Magnetic Recording) are two different types of hard disk drives. PMR drives are the traditional type of hard drive, while SMR drives are a newer type that offers some advantages over PMR drives.
PMR hard disk drives work by storing data on spinning disks that have magnetized areas on them. The data is stored as magnetic flux transitions between these magnetized areas. When you write data to a PMR drive, the head writes new data by changing the polarity of the magnets in the targeted area. This creates new magnetic fields that overwrite the old fields.
SMR hard disk drives work by taking advantage of the fact that not all data stored on a hard disk is accessed equally. In fact, most data is only accessed occasionally. SMR drives allow for the storage of more data per inch on the disk by taking advantage of this fact.
Traditional hard disk drives store data in sectors that are fixed in size. A sector is a small amount of space on the disk that stores a certain number of bytes of data. When a file is stored on a traditional hard drive, the entire sector containing that file’s data is copied to the hard drive, even if the file only takes up a fraction of that sector. This limits the amount of space available for storing files on a traditional hard drive.
The top three disadvantages of using SMR hard disk drives are as follows:
There is no definitive answer to this question since both PMR and SMR hard disk drives have their own advantages and disadvantages. However, in general, SMR hard disk drives tend to be more expensive but offer greater storage capacity, while PMR hard disk drives are less expensive but have a shorter lifespan.
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