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DISKS
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Text File
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1985-11-20
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5KB
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98 lines
DISKS Entered by the Warlock SASH
Not being technically minded, I couldn't begin to explain about
disks, or disk drives, or any other type of hardware. I decided
that I needed to know about disks and disk formats, and that the
information might prove helpful to others - hence this document.
Imagine a circular cake built up of a number of concentric
rings, and sliced into a number of portions - not a bad analogy of
a formatted disk. The concentric rings are called Tracks, with
track zero being the outermost ring and the innermost ring being
track 79/80/81/81/83 .. or whatever the maximum value is. The
slices of the cake are the sectors - usually 9/10 or even 11.
Tracks 0-1 are special tracks.
On a formatted single sided disk we have the following:-
Track 0, sector 1 = boot sector
Track 0, sector 2-6 = file allocation table one (FAT file)
Track 0, sector 7 to track 1, sector 2 = FAT 2
Track 1, sector 3 to track 1, sector 9 = directory
Track 2 to end of disk = file space.
The file allocation table keeps track of how your files are
stored on disk. 'For no reason at all' (according to ST FORMAT MAG.)
TOS keeps a copy of this - FAT 2 located in track 0.
The directory sectors hold the names of the files on the disk,
the file size and the date and time of any changes recently made
to the file. Also here is the address of the first cluster for
that file.
On a Double Sided disk this data is stored in a slightly different
manner:-
SIDE A, track 0, sector 1 = the boot sector
SIDE A, track 0, sector 2-6 = FAT
SIDE A, track 0, sectors 7-9 and
SIDE B, track 0, sectors 1 and 2 = FAT TWO
SIDE B, track 0, sectors 3-9 = directory
With the remainder of the disk holding the files.
Each sector on the disk can hold 512 bytes. 2 sectors are a
cluster. Due to this format - the smallest amount of space any
file can occupy is 1K.
When a file is deleted from the disk, it is not actually
instantly deleted. The FAT file and directory are altered but the
data is not removed from the disk until all the other available
space has been used. It is for this reason that we are allowed to
reclaim a wrongly erased file.
Thanks to ST FORMAT for that handy little snippet of
information.
So what do we do when we find a faulty disk ?
I go to the shop and purchase a blank disk for 70p or
whatever, then home. There I boot up my faithful Format 84 program
and attempt to format the new disk. AAAAAAAHHHH!!!! It won't
format ! I now have several options - I could return to the shop
and say "You Stupid Bastard - This Shitty Disk is Knackered". This
approach tends to cause offence and is generally leasty popular.
I could return to the shop and say "Excuse me. I've just purchased
this disk and find that it won't format - could I have a
replacement ?" at which the assistant stoops behind the counter to
where the reject box is hidden and selects another faulty disk to
give me. Why ? Simple - He thinks that you'll get pissed off with
running to and fro and give up all hope of getting a working disk,
OR - he'll inform you that it must be your disk drive thats faulty
and he'll repair it for only fifty quid.
I could send the disk to who-ever has been sending me copies of
the Sewer Docs. That person is responsable for using more wanky
disks than I knew existed. Either that, or the sewer rats are
cocking it up (- and I don't believe that for a minute).
(Not us!!... S.Possum)
Usually I return to the shop and wave the disk in the air and say
loudly "Disk Faulty" - no more, no less. Ten times out of nine
this does the trick.
Now - you've got an old disk that has simple died. There are
great big scuff marks along the disks surface, and its seen more
labels than you've had hot dinners. DO NOT throw it away. There
are millions of uses for expired disks.
Here are just a few -
1 - Remove the plastic case and use the actual disk as
a frisbee. This is awkward as the middle of the disk
tends to be too heavy.
2 - Use the whole thing as a place mat for cups.
3 - Return the disk to the manufacturers saying - "When I
bought this disk I was told that it had a lifetime
guarentee. I'm still alive but the disk is faulty"
4 - Send it to a publishing house with a note announcing
the latest advance in software protection.
5 - Use it to advance communications. Throw it at some
ignorant bastard.
6 - Break open the case and use both halves as book
markers
7 - leave the case intact and use as a plastic scraper.
8 - melt the whole disk and proclaim the end product as
a peace of classic modern art.
The list is endless.
Thats enough of this stuff. On with more serious things --
The Warlock. SASH.