Haedware Secondary Storage Devices

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Hardware
PSK TECHNOLOGIES PVT.LTD IT COMPANY Nagpur

• Secondary Storage

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SECONDARY STORAGE DEVICES

• History of Hard disk
• Types of Hard disk
• SATA Hard disk
• USB / External Hard disk
• SSD (solid State Drive) SSD
• SCSI (Scuzzy)
• What is Partitioning?
• Formatting

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Secondary Storage

• storage provides permanent or nonvolatile
  storage. Using secondary storage devices such as
  a hard disk, data and programs can be retained
  after the computer has been shut off.

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Hard Disk

• HDD is Non-volatile permanent storage device,
  Uses magnetic media for storing data, and Hard
  disks save files by altering the magnetic charges
  of the disks surface to represent 1s and 0s.
  Hard disks retrieve data and programs by reading
  these charges from the magnetic disk.
• Hard disks use rigid metallic platters that are
  stacked one on top of another.
• Hard disk store and organize files using tracks,
  sectors and cylinders.

• .

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History of Hard disk

• The first hard disk drives were small in
  capacity, physically large, and expensive when
  compared to the cost of drives today. They were
  about 4 inches tall, 5.25 inches wide, and 8
  inches long, and they weighed almost 10 pounds.
  In 1981, IBM introduced the XT computer with a 10
  MB hard drive. (Winchester Drive)

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Types of Hard disk

• PATA / IDE (Parallel Advanced Technology
  Attachment) Having 40 Pins

• PATA is capable of data transfers speeds of
  66/100/133 MBs/3 GBs second

• Molex Connector Use for Power RPM 5400/ 6400/ 7200

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Power PATA / IDE Hard Disk

• SATA Hard disk

1) SATA (Serial Advanced Technology Attachment)
It is Pinless hard disk SATA Molex Connector Use
for Power RPM 7200 SATA is capable of data
transfers speeds of 150/300/600 MBs/ to 6 GBs
second, Molex PSK TECHNOL
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USB / External Hard disk

• A USB hard drive is an external hard drive that
  connects via USB. It uses the same design as an
  internal hard drive, except comes in an external
  casing that protects the drive. The case also
  includes a USB interface, which allows you to
  connect the drive to your USB port using a USB
  cable.

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SSD (solid State Drive)

• Unlike hard disks , which rotate and have
  read/write heads that move in and out,
• Solid state storage devices have no moving parts.
  Data and information are stored and retrieved
  electronically directly from these devices.
• It is new hard disk than other , more costly and
  high speed hdd
• It is pinless Hard disk like sata
• Sata molex use for power
• Sata data cable use
• Access speed 6 Gbps plus

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SCSI (Scuzzy)

• SCSI (Scuzzy) Small Computer System Interface
• It is hot swap hard disk ,use in server It is
  available in 50 70 pins / pinless also
• Access speed 6gps plus RPM 10k, 15k plus

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What is Partitioning?

• Disk partitioning is the process of logically
  dividing the storage space of a hard disk into
  separate areas commonly called as partition or
  drives There are three types of partitions
• 1. Primary 2. Extended 3. Logical

Formatting

• A file system tells how the files and folders to
  be created are stored and retrieved.
• FAT 16 Use in Windows 98
• FAT 32 Use in Windows 98, XP, Vista ,Win 7
• NTFS Use in Windows XP, Vista win8, win10, Server
  OS.

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