Download - Storage devices
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STORAGE DEVICES AND ITS TYPES
HDD AND SSD(FLASH)
INTERFACING
NEW TRENDS
PROS AND CONS
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Device(space) used to store something !
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Device use to store information in magnetic or digital form in temporary or permanently and reproduced whenever required.
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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
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• .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.
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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)
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Storage device that uses flash technology but comes in the form factor of a conventional hard drive.
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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
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PARELLEL ATA
16 bit parallel data bus
40 pin cable
Signal crosstalk
SERIAL ATA
7 pin cable
25% of space by PATA
3Gbits/sec
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Fire Wire
USB
Fibre Channel
IDE
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Many inexpensive to form a SLED
Mirroring
Duplicate every disk
Parallel Disk Systems
Data Striping
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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
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Redundancy Array of Independent Disks
1
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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
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Model of networked enterprise storage where data is stored in virtualized pools of storage which are generally hosted by third parties.
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By R.Pradeepraj
PradeepRaj
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QUESTIONS ?