One would think that, unless the areal density of the platter has somehow changed, the difference in RPM would show up in the performance of a long sequential read.
CMR vs SMR is much more difficult to tell apart since I believe it is an edge case involving read modify writes between the drive interface electronics and the platter. This article on STH shows a dramatic difference during resilvering of a RAID array
Added: Some posters say that SMR drives report that they support TRIM whereas CMR drives don't. In Linux, 'sudo hdparm -I /dev/sdX' should tell you.
CMR vs SMR is much more difficult to tell apart since I believe it is an edge case involving read modify writes between the drive interface electronics and the platter. This article on STH shows a dramatic difference during resilvering of a RAID array
Added: Some posters say that SMR drives report that they support TRIM whereas CMR drives don't. In Linux, 'sudo hdparm -I /dev/sdX' should tell you.
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