Re: [nukkad] compres - Blank Spaces

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Harshal Chhaya wrote:
 
> The File Allocation Table (FAT) provides a map of the clusters where a file is stored. The operating system creates a FAT entry for each file that records where each cluster is located and their sequential order.

Though the basic information about FAT is correctly explained, I guess
it is NOT a complete map of all clusters occupied by a file. 

I think it has total file size, and the cluster no. where the file
starts. Then at the end (lat byte) of that cluster is the information
where the next cluster is stored, which may not be adjascent to first
cluster.

During defrag, all the non-adjascent clusters are re-written so that
they come adjascent and an entire file is written at one single space
without any break in between.

> The number after FAT (16 or 32) is the size in bits of each entry
> in the FAT. It does not refer to the cluster size.

16 or 32 is the nos. of bits.
Thus 2^16 = 65335, and 
     2^32 = 4294967296 that can be stored in it.
 
> If you assume that each FAT entry is only one digit long, it can refer

Here I missed it. FAT is having all the information about file name,
creation/ modification/ etc dates, access, size, and much more.

How can it be one digit long?

> A FAT32 system supports much larger disks and is the standard for
> Windows systems after Windows 95.

In Win 98 CD, there is a program that can convert FAT16 to FAT32. I have
not used it. 
 
> low-level format 

Is it FORMAT/T:Tracks/N:Sectors option?
How to calculate Tracks and Sectors from cluster size or vice versa.

I think when you create a harddisk partition, it is decided then and
there whether you want a FAT16 or FAT32.

Some Linux guy might tell that Linux fdisk is having separate code for
windows FAT16/ FAT32 partition. It calles them by some other name.

-Rawat



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