كل مايخص الحاسوب والبرامج (كمبيوتر -اندرويد) برمجة وغيرها
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a disk block is time consuming because of the seek time s and rotational delay (latency) rd.
All of the following ingredients A physical disk block (hardware) address except one:
Disk rotation moves the block under the read-write head for reading or writing
A read-write head moves to the track that contains the block to be transferred.
Whole blocks are transferred between disk and disk blocking for processing
Typical block sizes range from B=512 bytes to B=4096 bytes
The block size B is Variable for each system.
A track is divided into blocks.
The division of a track into sectors is hard-coded on the disk surface and can be changed.
A sectors is divided into smaller blocks or track
A sectors is divided into smaller blocks or
Track capacities vary typically from 4 to 50 bytes or more
Disks are divided into concentric circular tracks on each disk surface.
Data stored contains several magnetic disks connected to a rotating spindle.
Data stored as magnetized areas on magnetic disk surfaces
Preferred secondary storage device for low storage capacity and high cost.
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If record size R=2 kbytes
block size B=4096 bytes r=12288 records, The number of file blocks is
the program checks the subsequent positions in order until an unused (empty) position is found,
