Re: file I/O and block I/O

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Subject: Re: file I/O and block I/O
From: "Sushil Patil" <sushilpa@xxxxxxxxx>
Date: Thu, 15 May 2008 10:19:47 +0530
Cc: "Sandeep K Sinha" <sandeepksinha@xxxxxxxxx>, kernelnewbies@xxxxxxxxxxxx
In-reply-to: <9fd348280805140538k441ca9f3mfdb6554267cad4c9@xxxxxxxxxxxxxx>

Hi,

Is Block I/O necessarily a SCSI thing? I thought 'dd' command could be
used for block I/O over devices like floppy, CDROM, and IDE device?
Am I wrong?

File I/O is an I/O which is thought to be happening on logical entity "file".This is
purely an user level interpretation of data which file-systems portrays .

As its name indicates Block I/O is the chunked I/O.Its the thing that happens between file-system
and the block-device (maybe routed via volume manager).

The File I/O request is translated into Block I/O request when it comes to
_actually_ reading/writing data from/to the disk.This block I/O can be cached I/O
or non-cached (unbuffered) I/O (DIRECT I/O).

The data is read or written in chunks (called blocks) from disk for efficiency reasons.

I hope now file i/o and block i/o are somewhat clearer :)

~Sushil

Follow-Ups:
- Re: file I/O and block I/O
  - From: Mauricio Mauad Menegaz Filho

References:
- file I/O and block I/O
  - From: Vijay Chauhan
- Re: file I/O and block I/O
  - From: Sandeep K Sinha
- Re: file I/O and block I/O
  - From: Shreyansh Jain

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