Storage Device Choices

STORAGE

DEVICE

CHOICES

Storage Device Choices
SHOP HARD DRIVES

FORM FACTOR

BRAND

STORAGE TYPE

There are several factors that need to be taken into consideration. External drives are used as portable storage where as Internal drives can be used to increase laptop or desktop storage space.

RPM

CAPACITY

INTERFACE

CHOOSING A STORAGE TYPE

Storage Type
  • HDD - Hard Disk Drives are generally used for secondary storage. Hard disk drives stores data by writing it onto a plate with a magnetic coat on it.

    + Can store a large amount of data
    + Inexpensive

    - Slower transfer speeds due to moving parts
    - Shorter life span due to moving parts

    HARD DISK DRIVES
  • SSD - Solid State drives are storage drives which uses integrated circuits as memory to store information.

    + Faster transfer rates
    + Longer life span

    - Can store less data
    - More expensive


    SOLID STATE DRIVES
  • SSHD - Solid State Hybrid Drive combines the speed of a SSD with the storage capacity of a HDD. This allows for faster transfer speeds and greater capacity.

    + Faster transfer speeds
    + Larger storage capacity

    - More expensive
    - Faster performance only on cache information

    SOLID STATE HYBRID DRIVES

BRAND

Storage TypeStorage TypeStorage TypeStorage TypeStorage Type

Brand of the Storage device has a large impact on the life expectancy and failure rate of the Hard Drive.
Western Digital and Hitachi have the lowest failure rates for hard drives.

CAPACITY

Storage Type

When considering capacity you need to think about what will be stored on the drive.
Movies and videos will need a large amount of storage space, with a file size of between 350Mb - 1.4 Gbs.
Music and audio will need less with a general file size of between 2 - 15 Mbs.
Images are quite small however, the higher the quality of the image the greater the size. Ranges from 100Kbs - 5Mbs

FORM FACTOR

Storage Type

There are different form factors that drives come in. This size can determine that rate at which data can be transferred as well as the maximum amount of data it can hold.

Laptops generally use smaller sized drives to save on space either 1.8 Inch or 2.5 Inch
Desktop generally use 3.5 Inch drives, as space is more freely available.

  • 1.8 Inch
    54mm x 8mm x 78.5mm
  • 2.5 Inch
    69.85mm x 7-19mm x 100mm
  • 3.5 Inch
    101.6mm x 25.4mm x 146mm

INTERFACE

When looking at internal drives a consideration into which interface type needs to be taken into account.
This interface type will affect the rate at which data can be transferred.

  • SCSI - Small Computer System Interface was the standard connection interface in the mid-1990s SCSI is most commonly used for hard disk drives and tape drives.
  • FIBRE CHANNEL - Fibre Channel is the successor to SCSI, it has a wider range of uses than its predecessor.
  • PATA (IDE / EIDE) - This interface helped set a standard for host/controller interface. The 40-pin IDE/ATA connection transfers 16 bits of data at a time, on the data cable.
  • SAS - SAS is a new type of interface which allowed for higher transfer speeds and is compatible with SATA.
  • SATA - SATA interface can connect host bus adapters to mass storage devices such as hard disk drives and optical drives. This interface has the advantage of being hot swappable, faster transfer rates and smaller cable size.
  • There are three different SATA interfaces with different transfer speeds:

    SATA I (1.5 Gbit/s)
    SATA II (3 Gbit/s)
    SATA III (6 Gbit/s)

REVOLUTIONS PER MINUTE (RPM)

Storage Type

When considering a Hard Disk Drive you need to take into account the RPM of the hard drive.
The higher the revolutions per minute the faster the read and write speed.

Hard Drive RPM Range

  • 3 600
  • 4 200
  • 4 500
  • 4 900
  • 5 200
  • 5 400
  • 5 900
  • 7 200
  • 10 000
  • 15 000

All these factors need to be considered when selecting a storage device.

SHOP HARD DRIVES