Seagate 50TB HDD plans are now tied to a late-2027 qualification window, with broader shipments expected in 2028, the company told financial analysts and investors this week. The timing lands in a storage market where Seagate says demand from artificial intelligence infrastructure and cloud services has already locked up most of its nearline hard-drive capacity into calendar 2028.
Dave Mosley, Seagate’s chief executive, said on the company’s earnings call that “Mozaic 5,” its next platform for drives using more than 5TB per disk, remains scheduled for qualification shipments in late calendar 2027. That platform is Seagate’s third commercial hard-drive generation based on heat-assisted magnetic recording, or HAMR.
HAMR uses heat to help write data to magnetic media at higher density than conventional recording methods can comfortably handle. In Seagate’s roadmap, Mozaic 5 enables platters above 5TB each, which lets a 10-platter drive cross the 50TB line. For readers keeping score at home, this is the capacity-and-cost-per-bit side of the storage fight, the reason HDDs and SSDs still serve different jobs.
When will Seagate ship 50TB hard drives?
Seagate’s stated schedule puts qualification shipments in late 2027 and customer shipments after that in 2028. Tom’s Hardware reported that server makers typically need roughly two to six months to qualify new hard drives, while hyperscale cloud operators often take six to 12 months because they test reliability, durability, vibration, shock behavior and long-term operation at fleet scale.
The drives are expected to be available in conventional magnetic recording configurations for customers that prioritize general performance and flexibility, and in shingled magnetic recording configurations for buyers trying to squeeze maximum capacity into a rack. SMR overlaps tracks to raise density, but it usually requires more careful write management.
Seagate’s problem, if you can call selling almost everything a problem, is allocation. Mosley said the “vast majority” of Seagate’s nearline exabytes are now committed into calendar 2028 under long-term supply agreements. He also said some customers are trying to extend planning through 2029 and beyond, which Seagate reads as confidence in their future infrastructure requirements.
Those long-term agreements cover not only capacity measured in exabytes, but also product configuration and pricing. According to Seagate, those terms are already set for all of calendar 2027. For drives outside those agreements, and for newly signed deals, the company described a more flexible pricing posture.
Mosley called it a “value-based pricing strategy” aimed at matching stronger demand with profitable growth. Gianluca Romano, Seagate’s chief financial officer, said fiscal fourth-quarter volume was a bit higher and that some additional output may be available in fiscal Q1, adding that Seagate is pricing that output “at a very good price right now.”
HAMR is already becoming a larger share of Seagate’s nearline business. The company said HAMR products represented 40% of its nearline exabyte shipments as of early July and are on track to reach 70% by early July 2027. Mosley said Seagate expects to exit calendar 2026 with 50% of its HAMR exabytes on the Mozaic 4 platform, which supports 40TB-class drives.
The financial backdrop explains the confidence. For the fiscal fourth quarter ended July 3, Seagate reported revenue of $3.629 billion, up from $2.444 billion a year earlier. Gross margin rose to 52.3% from 37.4%, and net income reached $1.294 billion. For fiscal 2026, Seagate reported revenue of $12.195 billion, up from $9.097 billion, with net income of $3.184 billion and gross margin of 45.6%.
This story draws on original reporting from Tom's Hardware.
