[Scilab-users] Efficiency of drive usage

[Federico Miyara]

Dear all,

I've observed that the function wavread, which needs to retrieve some 
specific header data apart from the real audio data, uses an mget call 
for each of them. For instance, it is necessary to detect several string 
ID's each one followed by 4 byte integers.

I wonder if this is an efficient way to use the drive. I mean, each mget 
requires reading the disk content which means mechanically positioning 
the read-write head and picking the information.

However, it is known that on each read the head retrieves typically a 
4096 byte sector and the operating system may read at once several 
sectors into a cluster.

Do operating systems or Scilab, at a low level, ensure that if one 
performs several mget calls to retrieve closely packed data, the 
information will be retrieved from some buffer secured during the first 
physical read, instead of reading again the disk?

Thank you.

Regards,

Federico Miyara


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