New HDD For Toshiba Brand 2TB 3.5" PMR SATA 6 Gb/s 64MB 7200RPM For Internal Hard Disk For Desktop Hard Drive For HDWD120|Internal Hard Drives| - AliExpress
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Seagate promises 20TB PMR hard drives ready before the end of the year
Perpendicular recording - Wikipedia
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Western Digital/HGST Release 10TB PMR Helium HDD - StorageReview.com