SMR’s slow performance led to a controversy in 20 when people realized that manufacturers were selling SMR drives without labeling them (in both external hard disks and internal drives), arguably selling an inferior product without warning customers.
So SMR drives can perform dramatically slower than CMR drives. Long, sustained writes suffer speed penalties because if the cache fills up, each time an SMR drive overwrites part of a previous track, it must read and re-write the “partially covered” underlying data as well. When you copy data to an SMR drive, the drive temporarily stores the data in a special cache area and uses idle time later to organize it into shingled regions on the platter. While SMR drives increase capacity for lower cost (because the drives can use fewer platters than a CMR drive at the same capacity), the way they work also comes with a speed penalty. RELATED: The Best NAS Hard Drives of 2023 The manufacturers use the analogy of roof shingles that partially overlap each other to explain this technique, which is where the “shingled” part of the name comes from. SMR drives write data using a special method that partially overwrites previously written tracks on a hard disk platter. Recently, a new technique for increasing write density called “Shingled Magnetic Recording” (or SMR) has emerged.
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