Storage devices
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This presentation gives you about types of storage devices, how it is interfaced and new trends in it.
Transcript of Storage devices
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 ?
