Random IOPS
If I am reading the article correctly (and it appears from the existing comments that I am not the only one noticing this), the two head assemblies serve distinct areas (platter sets?) of the drive. So Random IOPS are only boosted to the extent they are evenly distributed between the two "logical" (virtual? semi-conjoined?) drives. Enforcing that means they are not exactly "random".
Compare and contrast to the IBM 350 (RAMAC)
https://www.ibm.com/ibm/history/exhibits/storage/storage_350.html
which could be had with two access mechanisms, each capable of reading/writing any sector on the disk. This option was introduced in 1958, and the last shipments were in 1961 (from article cited, so you don't _have_ to read it).
Note this was for "one of the last vacuum tube based systems" from IBM.
The follow on 1405 also (IIRC) had optional dual access mechanisms. Wikipedia
https://en.wikipedia.org/wiki/History_of_IBM_magnetic_disk_drives#IBM_1405
says "one to three" access arms.
Biting the hand that feeds IT
