You can put 70 SSDs and HDDs in this case to deliver almost 3PB capacity - and it got me thinking, why aren't there any 3.5-inch SSDs?

AIC SB407-VA packs 70 drive bays into 4U, delivering nearly 3PB capacity with modern Xeon scalability.

source https://www.techradar.com/pro/you-can-put-70-ssds-and-hdds-in-this-case-to-deliver-almost-3pb-capacity-and-it-got-me-thinking-why-arent-there-any-3-5-inch-ssds