| Submitted by saraan on 27/06/2014 - 10:52 AM |
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| I read this again and again (esp being into DBMS, that will be closely knit with storage system) that in hard disk drive, platters keep rotating continuously and once we have to read data, the pinnacle reads the info, when the needed block comes below it (and track positioning being done by head by to and fro motion). I was wondering, why did we've to allow the platter move continuously. Another alternative has been to allow it to move only if we need to read data or another wild option could possibly be to let the pinnacle move!! The platters moving continuously just sounds too much of work!!!! |
| Submitted by saraan on 27/06/2014 - 10:52 AM |
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| Submitted by Tanvi on 08/07/2009 - 12:06 PM |
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Hi Sandhya,
Can you tell me regarding the capacity of the Hard disk? How it works on different computers? |
| Submitted by Tanvi on 08/07/2009 - 12:06 PM |
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| Submitted by Sandhya on 08/07/2009 - 12:13 PM |
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Capacity of Harddisk:
A typical desktop machine will have a hard disk with a capacity of between 10 and 40 gigabytes. Data is stored onto the disk in the form of files. A file is simply a named collection of bytes.
When a program running on the computer requests a file, the hard disk retrieves its bytes and sends them to the CPU one at a time.
Performance:
There are two ways to measure the performance of a hard disk:
* Data rate - The data rate is the number of bytes per second that the drive can deliver to the CPU. Rates between 5 and 40 megabytes per second are common.
* Seek time - The seek time is the amount of time between when the CPU requests a file and when the first byte of the file is sent to the CPU. Times between 10 and 20 milliseconds are common. |
| Submitted by Sandhya on 08/07/2009 - 12:13 PM |
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