HOW DATA IS STORED ON/ RETRIEVED FROM THE HARD DISK Most important chapter in computer science.
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HOW DATA IS STORED ON/ RETRIEVED FROM THE HARD DISK Most important chapter in computer science. interesting knowledge in computer science subject.
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Computer Science
HOW DATA IS STORED ON/ RETRIEVED FROM THE HARD DISK
As shown above the data is organized into tracks and sectors. Each track has a unique number.
First track always has the number 0 0 0 called track zero. Similarly sectors on a track are numbered. When some software or operating system of the computer wants to read some data on some part of the disk it specifies the address of the location and provides the data.
By using the provided address, the disk to route the disk platters Because of this mechanical component this process is very slow as compared to the speed of the processor. When the head reaches the required track the read/ write head has to wait for some time so that the required sector come sunder it due to the rotation of the platters. This delay is called the rotational delay.
When appropriate sector come under the read/ write head it read the data from the disk and send this data to the processor. The time consumed in this process is called the transfer delay. These three delays are used to calculate the access time of data
Access Time = Seek Time + Rotational delay +Transfer Delay
Obviously the seek time and rotational delay involve mechanical parts and are very large. Because of the delays the hard disk is very slow as compared to the CPU
Computer Science
HOW DATA IS STORED ON/ RETRIEVED FROM THE HARD DISK
As shown above the data is organized into tracks and sectors. Each track has a unique number.
First track always has the number 0 0 0 called track zero. Similarly sectors on a track are numbered. When some software or operating system of the computer wants to read some data on some part of the disk it specifies the address of the location and provides the data.
By using the provided address, the disk to route the disk platters Because of this mechanical component this process is very slow as compared to the speed of the processor. When the head reaches the required track the read/ write head has to wait for some time so that the required sector come sunder it due to the rotation of the platters. This delay is called the rotational delay.
When appropriate sector come under the read/ write head it read the data from the disk and send this data to the processor. The time consumed in this process is called the transfer delay. These three delays are used to calculate the access time of data
Access Time = Seek Time + Rotational delay +Transfer Delay
Obviously the seek time and rotational delay involve mechanical parts and are very large. Because of the delays the hard disk is very slow as compared to the CPU
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