What is Flash Memory ? Flash Memory Devices
Welcome friends, previous posts mein Maine almost sabhe storage devices ke bare mein dedicated articles likhe hain. Aap ushe visit kar information le sakte hain. Abhi bhi ek aur memory type bache hain jis ke bare mein Main iss post mein batayunga. Yeah storage device sabse latest storage medium hain. Issko memory aur solid state memory kaha jata hain. Iss post ke andar Main short mein USB flash stick, NOR, NAND etc... jaise topic ko cover karunga.
What is Solid State Storage ?
Solid State storage ko flash memory bhi kaha jata han. Magnetic devices like - hard disk drive, magnetic tape etc... ke tarah in mein koi bhi moving part nahi hota. Yahe karan hain ki inko 'solid state storage' bhi kaha jata hain. Flash memory puri tarah electronic circuits par based hote hain. Flash memory mostly USB flash drive (pen drive), solid state drive, digital cameras, audio player etc... mein use ki jate hain.
Solid state devices mein data binary code mein store hota hain. Flash memory mein millions aur billions mein choote choote low - voltage switches hote hain jis ko transistors kaha jata hain. Jab switch open hota hain toh binary one present hota hain. Aur agar switch close hota hain tab binary zero present hota hain.
Development of Flash Memory: Flash memory 1980's ke time mein invent hue the. Inhe sabse pehle Fujio Masuoka ne introduce kiya jo Tashiba mein developer the. Iske bad 1988 mein Intel ne NOR flash chip ko introduce kiya. Aur 1989 mein NAND flash memory ko Toshiba ne introduce kiya. But us time flash memory bhot expensive hote the. 1991 mein SanDisk ne sirf 20MB ki flash SSD thousand dollors mein launch ke the. Iss ke bad se flash memory mein lagatar improvement hota raha. Jis se ab yeah bhot kam prices mein available ho paye hain.
Flash Memory Types :-
Flash memory 2 types mein available hain. Dono he types ke architecture mein thoda difference hain. Flash memory ke types hain :-
- NAND Flash Memory
- NOR Flash Memory
NAND Flash Memory: NAND flash mein cells series mein wired (connect) hote hain. NAND cells ko kam wires ki jaroorat hote hain aur yeah aachi density mein chip par lage hote hain. NAND flash price mein saste hote hain aur iss mein lagatar data ko read aur write kiya ja sakta hain.
NOR Flash Memory: NOR flash mein cells aapas mein parallel wired hote hain. NOR flash ke reading process RAM ki tarah hote hain. NOR mein ham data ko bina RAM mein copy kare directly execute kar sakte hain.
Flash Memory Devices :-
Flash memory devices mostly 3 types ke hain. Yeah sabhe non-volatile memory hain means power OFF ho jane ke bad bhi in mein data stored rahaga. Yeah devices hain :-
- USB Flash Sticks
- Memory Cards
- Solid State Drive
USB Flash Sticks: USB flash sticks ko Pen Drive bhi kaha jata hain. Yeah bhot high capacity mein bhi easily available hote hain. USB post sabhe computers mein paya jata hain iss liye pen drives, data ko ek computer se kise aur computer share transfer karne ke liye use hote hain. Pen drives ka use bootable drive, backup device etc... ke liye bhi kiya jata hain.
Memory Cards: Memory cards ka mostly use mobile phones, digital camera jaise devices mein kiya jata hain. Yeah physically thode choote hote hain but capacity mein 256 GB tak ka data store kar sakte hain. Inhe card reader se connect kar ke computers se bhi connect kar sakte hain.
Flash memory mein sabse popular aur important device mein se ek Solid State Drive hain. Iss ke complete information ke liye mein next post ko visit kare. Woh pure tarah se SSD ke liye he dedicated hain.
Advantages of Flash Memory :-
Non - Volatile: Flash memory non-volatile memory hote that means in mein power OFF hone ke bad bhi data stored rehta hain.
Portability: Flash memory size mein small aur light weight hote hain. Iss liye yeah bhot aachi portable device hain.
Fast Speed: Normal hard disk drive ke compare mein flash memory bhot fast hote hain.
Solid State: Flash memory solid state mein hote hain. In mein koi bhi moving parts nahi hote hain.
Durability: Flash memory mein koi bhi moving part nahi hone se, flash memory jaldi kharab nahi hote.
Power Consumption: Magnetic devices ke compare mein flash memory ko bhot kam power ki jaroorat hote hain.
Disadvantages of Flash Memory :-
Low Capacity: Flash memory, storage medium ke liye new technology hain. Iss liye abhi yeah bhot kam capacity mein available hote hain. Hard disk normally 4TB, 8TB tak easily available hote hain but such as - SSD 500GB (Gigabyte), 1TB (Terabyte) ke liye bhi rarely available hote hain.
Costly: Flash memory, traditional storage medium ke compare mein bhot fast hote hain iss liye yeah bhot expensive hote hain.
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