fdformat

[Alexios Chouchoulas]

On Wed, 21 Jan 1998, Harris Kosmidhs wrote:

> H fdformat sumfona me to man page kanei low-level format.
> Ka8oti asxetos, ti 8a pei auto? Den orizetai file system?

  Oxi me thn fdformat(8). Afth kanei mono to low-level format. To high-level
format einai h dhmiourgia tou filesystem se ena low-level formatted device.

  To low-level format dhmiourgei ta sector descriptors panw sthn epifaneia
tou diskou (afhnei xwro gia ena magic number wste h kefalh na mporei na brei
thn arxh enos sector, gia ena sector-ID wste to drive na mporei na kserei
poio sector diabazei, ena CRC kai merika magic numbers akoma). Eixa kapou to
plhres spec ths IBM kai ths Shugart, alla twra ola afta ta kitapia einai sto
Ellanta.

  Basika to low-level format einai xrhsimo epeidh oloi oi diskoi kai oi
disketes mas einai soft-sectored (koinws mporeis na exeis opoiondhpote
arithmo sectors ana track). Palia oi perissoteres disketes (kai diskoi) htan
hard-sectored. Eixan dhladh polles trypes sthn epifaneia tous, pou to drive
anixneve gia na kserei pou na ksekinhsei na grafodiabazei ena sector (oi
soft-sectored disketes exoun mono mia trypa pou markarei *peripou* thn arxh
tou prwtou sector tou track).

  Opws eipan kai oi ypoloipoi kai kalytera apo mena, to DOS kanei aftomata
low-level kai high-level format stis disketes, kai mono high-level stous
sklhrous (alliws to formarisma sklhrou tha epairne wres -- teleftaia metrhsh
mou htan dyomish wres se enan 1.6G).

  Opote otan formareis ena flopaki prepei na tou dhmiourghseis prwta sectors
(me to fdformat(8)) kai meta ena filesystem (me to mk*fs(8) ths protimhshs
sou, h to mformat(1) an eisai opados twn mtools(1)).


> An omos kano mount /dev/fd0 /mnt;cp /vmlinuz /mnt
> h dd if=/vmlinuz of=/dec/fd0 pou leeo sto Boot-HOWTO den mou ginete?

  To prwto sigoura den ginetai. Ypothetei oti exeis dhmiourghsei filesystem
sthn disketa. Oi kernel boot disketes synithws einai enas sketos kernel
grammenos panw sto floppy xwris filesystems kai tetoies ahdies. Afto kanei h
defterh entolh, h dd(1), pou tha *eprepe* na doulevei (arkei na einai
formarismenh h disketa).

  Profanws an den exeis formarei katholou th disketa, den exei sectors panw,
opote to floppy den mporei na grapsei panw sta sectors ths (hardware
limitation afto -- to "sector not found" einai lathos pou anaferei o
hardware floppy controller an parei dyo index pulses apo to drive (dyo
peristrofes) kai den exei brei to katallhlo sector ID akoma.

  Ligo karatexniko to zhthma, alla apla prepei na exeis kanei low-level
format stis disketes sou prin tis xrhsimopoihseis.

A.

-------------------------- ,o88,o888o,,o888o. --------------------------------
Alexios Chouchoulas         '88    ,88'   ,88'   http://www.vennea.demon.co.uk 
The Unpronounceable One    ,o88oooo88ooooo88oo,     alexios at vennea.demon.co.uk

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