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The journey of a byte has two parts.
1.part that takes place inside the memory:
- statement calls the operating system.
- file manager (which is a part of the operating system which deals with I/O) will
- check if the operation is permitted
- locate the physical location where the byte will be stored
- find out if the sector (of the located physical location) is already in memory (in case it is not then call the I/O buffer)
- put the byte in the I/O buffer
- keep the sector in memory to see if more bytes will be written on the same file
2.part that takes place outside the memory:
- I/O processor will wait for an external data path to become available
- disk controller:
- I/O processor asks the disk controller if the disk drive is available for writing
- instructs the disk drive to move its read/write head to reach the right sector
- disk reaches the right sector and the byte is written
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