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Index > OS Construction > floppy disk wear n tear

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GhostXoPCorp



Joined: 13 Dec 2008
Posts: 199
Location: 01F0:0100
GhostXoPCorp
i know, im getting very annoying posting thousands of questions, well i think i am. but the bios int 13h says i can load multiple sectors, say

one way of doing it: ;loads 5 sectors at once
load 5 sectors
ret


or

another way of doing it: ;loads a sector at a time, 5 times
load one sector
cmp register, 5
je done
sub register,1
jmp another way of doing it



would function #2 wear on the floppy disk drive?

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Oh that divide overflow. Just jumps out of the bushes every time to scare the day lights out of me.
Post 04 Jan 2010, 07:49
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edfed



Joined: 20 Feb 2006
Posts: 4237
Location: 2018
edfed
3 times is enough.

1 sector at a time, 3 retries (if cf set or reset (don't remember exact value)

i tested many possibilities with bios. the only who always works is that one.

then, do that:

Code:
mov eax,LBA ; do LBA addressing for simplicity
LOOP:
dec [count]
jl .end
call read
inc eax
/LOOP
.end:

read:
call lba2bioschs
int13h
jc .end
int13h
jc .end
int 13h
jc .end
.error:
.end:
/read
    
Post 04 Jan 2010, 17:35
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Dex4u



Joined: 08 Feb 2005
Posts: 1601
Location: web
Dex4u
I always use one sector at a time and have the same test PC and floppy drives for over 5 years, with no problems with wear etc.
Post 04 Jan 2010, 21:54
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GhostXoPCorp



Joined: 13 Dec 2008
Posts: 199
Location: 01F0:0100
GhostXoPCorp
thanks

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Oh that divide overflow. Just jumps out of the bushes every time to scare the day lights out of me.
Post 04 Jan 2010, 21:55
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Tyler



Joined: 19 Nov 2009
Posts: 1216
Location: NC, USA
Tyler
Have you ever run out of retries?
Post 04 Jan 2010, 23:30
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ManOfSteel



Joined: 02 Feb 2005
Posts: 1154
ManOfSteel
It happens with dead/dying disks with bad sectors.
The FDC can be quite "stubborn", but 3 retries should be good.
Post 04 Jan 2010, 23:39
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