HARD DISK

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हार्ड डिस्क ड्राइव का व्यावसायिक उपयोग 1957 में IBM     मैं डिस्क स्टोरेज सहित IBM 305 RAMAC सिस्टम के उत्पादन के शिपमेंट के साथ शुरू हुआ था।  US पेटेंट 3,503,060 को 24 मार्च, 1970 को जारी किया गया था, और IBM RAMAC प्रोग्राम से उत्पन्न होने को आमतौर पर डिस्क ड्राइव के लिए मौलिक पेटेंट माना जाता है।
hard disk is a secondary storage device.It is made by magnetic material that helps in storing data . hard disk stores data 1g.b.to40 gb. now days terabyte(TB) hard disk available in market.
Type-
1- standard drive ( IDE/ ATA).
2- Serial  ( sata).
3- scsi hard disk. 
4- External hard disk  drives( usb 2.0).
5- wireless hard disk.
IDE- It transfer data 16 bit speed 100 mb. 133 mb per/sec use 40 pin connector.

Sata- Transfer data 1 bit speed 600mb.connect use 7 wire connector maximum length 1 meter.

SCSI- It is used to typical network  server which  include lot of processing. speed interface that enable you to connect up to
15 device on a single port.

External- interface- u.s.b. 2.0
                  rpm- 7200
                  cache- 8m.b.

Wireless- harddisk- external
                   interface- u.s.b.
                    rpm- 54 m.b.p.s.
                    port- r.j. 45
Platter - It is round disk made by  some metal glass.

Recording media- It is made up magnetic material such as iron oxide . It spread on platter. data store on this layer.

Read /write head- The read write head  read or write the data on hard disk. it convert binary to magnetic pulse.

Head actulator- It move to read write head.
Air filter - Air filter clean air in hard disk .

रीड/राइट हेड- रीड राइट हेड हार्ड डिस्क पर डेटा को रीड या राइट करता है।  यह बाइनरी को मैग्नेटिक पल्स में बदल देता है।
हेड एक्ट्यूलेटर- यह रीड राइट हेड के लिए आगे बढ़ता है।

 एयर फिल्टर - एअर फिल्टर का प्रयोग हार्ड डिस्क के अन्दर Air को फिल्टर करने में होता है।

Fat- File data known as cluster in a hard disk.
Fat 16- Fat 16 capacity 2 (g.b.).
Fat 32-  capacity 2 (T.b.).
N.T.F.S- IT'S use for security.



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