tashqil xotira va ularning turlari

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s1.xml ppt/diagrams/quickstyle1.xml ppt/diagrams/layout1.xml ppt/theme/theme2.xml ppt/theme/theme1.xml ppt/media/image2.wmf ppt/media/image8.png ppt/media/image5.png ppt/media/image4.png ppt/embeddings/oleobject1.bin ppt/embeddings/oleobject2.bin ppt/media/image45.png ppt/media/image26.png ppt/media/image49.jpeg ppt/media/image53.jpeg ppt/media/image52.jpeg ppt/media/image51.jpeg ppt/media/image41.jpeg ppt/media/image40.jpeg ppt/media/image28.png ppt/media/image27.png ppt/media/image33.jpeg ppt/media/image35.png ppt/media/image38.jpeg ppt/media/image34.jpeg ppt/presprops.xml ppt/viewprops.xml ppt/tablestyles.xml docprops/app.xml ppt/media/media2.mp4 docprops/core.xml ppt/media/media1.mp4 ppt/media/image1.png ppt/media/image13.png ppt/media/image16.png ppt/media/image18.png ppt/media/image21.png ppt/media/image22.png ppt/media/image24.png ppt/media/image25.png ppt/media/image29.png ppt/media/image3.png ppt/media/image30.png ppt/media/image31.png ppt/media/image32.png ppt/media/image36.png ppt/media/image37.png ppt/media/image39.png ppt/media/image42.png ppt/media/image43.png ppt/media/image44.png ppt/media/image46.png ppt/media/image47.png ppt/media/image48.png ppt/media/image50.png ppt/media/image54.png ppt/media/image55.png ppt/media/image56.png ppt/media/image57.png ppt/media/image58.png ppt/media/image6.png ppt/media/image64.png ppt/media/image7.png ppt/slides/_rels/slide36.xml.rels ppt/slides/slide15.xml ppt/slides/slide27.xml ppt/slides/slide36.xml [content_types].xml _rels/.rels docprops/custom.xml tashqi xotira va ularning turlari . raid massivlar . optik disklar optik diskning yuzasi aks ettirishning turli usullariga sohalardan iborat . diskovodning lazer nuri disk yuzasiga urilib , aks ettiriladi va kompyuterning raqamli kodiga aylantiriladi ( aks ettrish – 1, aks etmaydi – 0). 3 kompyuternig tashqi xotirasi katta hajmdagi ma’lumotlarni uzoq vaqt saqlash uchun mo’ljallangan . kompyuterning tashqi xotirasi energiyaga bog’liqmas hisoblanadi . tashqi xotira ma
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gnit va optik disklarda va magnit lentalarda bo ’ lishi mumkin . reja 2 1 7 - mavzu . tashqi xotira va ularning turlari, raid massivlar . lazerli disklar klassifikarsiyasi : yozish imkoniyati mavjud emas cd-rom (compact disk read only memory) va dvd-rom (digital video disk read only memory) ; bir marta yozish va ko’p marta o’qish cd-r va dvd-r ; ko’p marta qayta yozish cd-rw va dvd-rw ( rw – re writable). 17 lazerli cd- disklar o vozli cd ( compact disk ) diametri 12 sm 74- 80 minut ovozminut cd-rom, cd-r, cd-rw : 650- 700 m bayt cd-rom – faqat o’qish cd-r ( bo’m-bo’sh ) – bir martalik yozish cd-rw – ko’p martalik yozsih mini - cd (- r, -rw) diametr 8 sm 24 minut ovoz , 210 mbayt ishonchlilik , chidamlilik k o’p arzon v inchestrga qaraganda o’qish va yozish tezligi past style.visibility style.visibility style.visibility style.visibility style.visibility …
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n ma ’ lumot miqdori (1 bit / mm); ma’lumotlarni almashish tezligi . 5 disketlar emd = egiluvchan magnitli disk , floppy disk 5,25 ’’ ( dyum ) 3,5 ’’ yozisjga ruxsat etish formatlash – belgilash , sektorlar va yo’laklarni chizish . 1,44 mbayt 300 ay / min style.visibility style.visibility style.visibility style.visibility style.visibility style.visibility style.visibility style.visibility style.visibility style.visibility egiluvchan diskda 80 yo’lakli 2 tomoni bor . har bir yo’lakda 18 ta sektor mavjud . bitta sektor hajmi = 512 bayt . disk hajmi = 2*80*18*512=1,44 mbayt 13 qattiq disklardan ma’lumotlarni o’qish va yozish tezligi diskning tez aylanishi (7200 ay / min ) tufayli ancha yuqori (133 mbayt /s atrofida ). qattiq disklarning hajmi 2 tbayt gacha bo’lishi mumkin . qattiq magnitli disklar ( vinchestr ) birinchi qattiq disk tashuvchilari 1955 yilda ishlab chiqilgan . d iametri 24 dyumli 50 diskdan iborat tashuvchining hajmi 5 mbayt bo’lib , aylanish tezligi 1200 …

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