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Amazon.com: HP 653950-001 146GB hot-plug dual-port SAS hard disk drive - 15,000 RPM, 6Gb/sec transfer rate, 2.5-inch small form factor (SFF), Enterprise, SmartDrive Carrier (SC) - Not for use in MSA products :
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Amazon.com: HP 695842-001 4TB SAS Hard Drive Disk (HDD) - 7,200 RPM, 3.5-inch form factor, SmartDrive Carier (SC), Midline (MDL), 6Gb per second Transfer Rate (TR) : Electronics
![Hard Disk Geometry. Physical Sizes ( Also called Form Factor) Hard Drives currently come in 2 main sizes: 2.5” and 3.5” 2.5” Drives are for laptop computers. - ppt download Hard Disk Geometry. Physical Sizes ( Also called Form Factor) Hard Drives currently come in 2 main sizes: 2.5” and 3.5” 2.5” Drives are for laptop computers. - ppt download](https://images.slideplayer.com/32/10021242/slides/slide_2.jpg)