ازهلها | Ezhalha
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نمایش بیشتر1 302
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آرشیو پست ها
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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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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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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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The division of a track into sectors is hard-coded on the disk surface and can be changed.
