Primary Storage

Primary Storage

1. Primary Storage

2. Secondary Storage

   • Hard Disk Drives
     • A hard disk drive is a nonvolatile computer storage device that can be mounted inside a computer or server, or connected externally via a USB or IEEE1394 (FireWire) port. They can also be connected via Ethernet as a network device. It is used as the primary storage device for a computer system.
     • Has Lots of moving parts
   • IBM 350 RAMAC, capacity 5Mb
     • IDK
   • HardDrive
     • Currently, we can group hard drives into four types: Parallel Advanced Technology Attachment (PATA) Serial ATA (SATA) Small Computer System Interface (SCSI) Solid State Drives (SSD)
   • Serial ATA
     • SATA drives can transfer data faster than PATA types by using serial signalling technology. SATA cables are thinner and more flexible than PATA cables. They have a 7-pin data connection, with cable limit of 1 meter. Disks do not share bandwidth because there is only one disk drive allowed per SATA controller chip on the computer motherboard. They consume less power. They only require 250 mV as opposed to 5V for PATA.
   • Small Computer System Interface
     • Small Computer System Interface is a set of standards for physically connecting and transferring data between computers and peripheral devices. The SCSI standards define commands, protocols, electrical, optical and logical interfaces.
   • Solid State Drives [SSD]
     • Has no Moving Parts
   • External HardDrive

3. Cache

4. RAM

5. ROM