The Archive HDD is currently available in 5, 6 and 8TB models and is aimed primarily towards large-scale data centers and users (mostly professionals) who require lots of space for backup purposes. To that end Seagate focused more in reliability than performance with the Archive HDD line so this time over they’ve used Shingled Magnetic Recording (SMR) technology to produce higher platter density (maximizes the number of tracks per inch) and provide increased data protection since aside the usual cache (128MB for this model) which can improve performance and is also used in HDD models this drive also makes use of on-drive cache (almost 20GB in size) for inbound writes and garbage collection something which is not actually new since it’s been used in SSDs.

Link