By

R.PradeepRaj (pradeeprajr93@gmail.com)

STORAGE DEVICES AND ITS TYPES

HDD AND SSD(FLASH)

INTERFACING

NEW TRENDS

PROS AND CONS

Device(space) used to store something !

Device use to store information in magnetic or digital form in temporary or permanently and reproduced whenever required.

OPTICAL STORAGE

FLASH STORAGE

MAGENETIC STORAGE TAPE DRIVE

FLOPPY DISK

HARD DISK

CD ROM

DVD ROM

FLASH DRIVES (PEN DRIVE)

SOLID STATE DEVICE(drive)

HYBRID DISK DRIVE CLOUD STORAGE

• .Disk spins 120 times per second (7200

RPM/60)

• Each spin transfers a track of 80 KB (160

sectors x0.5K)

• Sustained average transfer rate is 120x80 =

9.6MB/s.

NOR based flash

Allow Random Access

High cost and less durable

Direct code execution

NAND based flash

No random-access external address bus

Mass storage

miniSD, microSD 64MB to 64GB

Dr.FUJIO MASUOKA ( TOSHIBA)

Storage device that uses flash technology but comes in the form factor of a conventional hard drive.

Wear levelling ◦ Counting writes & dynamically remapping blocks

Bad block management ◦ Write verification and remapping bad sectors

Multi-Level Cell technology ◦ Memory cells store more than one bit

PARELLEL ATA

16 bit parallel data bus

40 pin cable

Signal crosstalk

SERIAL ATA

7 pin cable

25% of space by PATA

3Gbits/sec

Fire Wire

USB

Fibre Channel

IDE

Many inexpensive to form a SLED

Mirroring

Duplicate every disk

Parallel Disk Systems

Data Striping

Selecting a RAID Level • RAID 0 – High-Performance applications where

data loss is not critical

• RAID 1 – High Reliability with fast recovery

• RAID 5 – Preferred for storing large volumes of data

• RAID 10-High fault tolerant & Expensive

Redundancy Array of Independent Disks

1

SSD HDD Cost Highly expensive Moderate

Speed High boot-up speed Low speed

Fragmentation No Prevails

Durability Shock resistant Less

Availability Less More providers

Size No limitation Limited to 1.8 inch

Noise Not at all Prevails

Model of networked enterprise storage where data is stored in virtualized pools of storage which are generally hosted by third parties.

By R.Pradeepraj

PradeepRaj

QUESTIONS ?