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لا تقع ضحية للمخادعين! تيليمتريو يكتشف ويُميّز هذه القنوات 👉 إذا كنت تريد رؤية العلامة، اشترك

ازهلها | Ezhalha

ازهلها | Ezhalha

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🎓 ازهلها | Ezhalha مساحة تساعدك في رحلتك الجامعية من الفكرة إلى الإنجاز. 💡 مشاريع تخرج • برمجة • أبحاث • عروض تقديمية • تقارير • سيرة ذاتية • تدريب وشروحات محتوى مفيد، أدوات ومصادر، ونصائح تساعدك تتعلم وتنجز بشكل أفضل. 🚀 ازهلها.. وخلك مركز على هدفك

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includes information that describes the file
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is a sequence of records
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Refers to records that exceed the size of one or more blocks and hence span a number of blocks.
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bfr refers to the number of records per disk.
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There may be empty space in a block if an integral number of records do not fit in one block.
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Blocking factor (bfr) refers to the storing a number of records per block.
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Refers to storing a number of records in one block on the disk
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Variable length fields can be mixed into one record
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Records contain tracks which have values of a particular type
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Type of records:
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Double buffering can be used to speed up the transfer of contiguous disk blocks.
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a disk block is time consuming because of the seek time s and rotational delay (latency) rd.
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All of the following ingredients A physical disk block (hardware) address except one:
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Disk rotation moves the block under the read-write head for reading or writing
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A read-write head moves to the track that contains the block to be transferred.
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Whole blocks are transferred between disk and disk blocking for processing
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Typical block sizes range from B=512 bytes to B=4096 bytes
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The block size B is Variable for each system.
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A track is divided into blocks.
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The division of a track into sectors is hard-coded on the disk surface and can be changed.
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