10 platters isn't anything too extreme. I remember some 5.25-inch full-height[1] SCSI drives from the 1990s had lots of platters. The Seagate ST410800 had 14 p

10 platters isn't anything too extreme. I remember some 5.25-inch full-height[1] SCSI drives from the 1990s had lots of platters. The Seagate ST410800 had 14 platters and 27 heads[2]. According to Wikipedia[3], the IBM 350 was the first disk drive, and it had 52 platters! --- [1] i.e. twice the height of a "regular" 5.25-inch drive bay in a PC case, which is actually half height. [2] See p. 14 of the spec sheet (https://www.seagate.com/staticfiles/support/disc/iguides/scsi/e8850b.pdf https://www.seagate.com/staticfiles/support/disc/iguides/scs...) and a YouTube video (https://www.youtube.com/watch?v=_LhneJ2u8WQ https://www.youtube.com/watch?v=_LhneJ2u8WQ) which says 13 in the description but shows 14 in the video. [3] See https://en.wikipedia.org/wiki/History_of_IBM_magnetic_disk_drives#IBM_350 https://en.wikipedia.org/wiki/History_of_IBM_magnetic_disk_d... . But if you follow their link to IBM's info (https://www.ibm.com/ibm/history/exhibits/storage/storage_350.html https://www.ibm.com/ibm/history/exhibits/storage/storage_350...), IBM says 50, not 52. I guess it's hard to count hard disk platters?