You might be the not so proud owner of an SMR drive…
as @aad stated the speed of a disk is down to mechanics, the size in this case is practically irrelevant…
SMR drives will rewrite multiple tracks at once, thus it will have a vastly slower write speed under continual load.
while a conventional drive writes only one track at a time.
basically the problem is that an SMR drive has to read the other tracks store them in its buffer than then rewrite multiple tracks when it adds new data to a section.
SMR drives are slightly cheaper than CMR drives… but not so much that it matters, ofc for those that only use them for storing movies or mainly do read operations it won’t matter…
but SMR is terrible at sustained writes…
however SMR will read at the same speeds as a CMR drive.