Bliss

[Alexios Chouchoulas]

Peri "xtyphmenwn" diskwn apo ious.

Paides, nomizw oti yparxei mia mikrh parekshghsh oson afora ta bad sectors
pou dhmiourgountai apo ious.

Ta bad sectors markarontai se ena bitmap mesa sto filesystem (epishs mporoun
na markaristoun kai sto sector ID block pou einai low-level data type panw
sto disko (aneksarthta apo leitourgiko kai efarmogh).

Otan enas ios dhmiourgei bad sectors, afto pou kanei einai oti *MARKAREI*
kapoia sectors ws bad. Den mporei na grapsei bad sectors giati afto einai
adynato (e kala, den kobw kai to kefali mou) me IDE diskous (kai me SCSI,
kai pithanotata kai me ESDI. Me MFM h RLL diskous einai panefkolo, alla an
exete MFM/RLL teinete na anhsyxeite gia to pote tha pethanei o 10-15eths sas
diskos, oxi gia to an exei ious).

Ara o ios bolevetai me to na markarei ta sectors ws bad eite sto filesystem
(high level) eite sto sector ID block (low level). Sthn prwth periptwsh ena
format diorthwnei thn katastash. Ta sectors DEN einai xalasmena physically!
Apla o ios exei kanei to systhma na nomizei oti einai.

Sthn defterh periptwsh h katastash einai ligo pio idiazousa (alla den exw
petyxei pote mou kati tetoio). To high-level format (FORMAT.{COM,EXE},
mke2fs, klp) den arkei, giati to sector einai markarismeno ws bad se xamhlo
epipedo. Edw h katastash apaitei low level format. MHN to kanete an den
kserete akribws ti kanete. Stous IDE diskous genika den einai o,ti kalytero.


> Me enan syndyasmo ths badblocks kai fsck mporeis na vreis kai na dior8wseis
> (shmadepseis) ta katestramena.

  Sthn pragmatikothta den exeis katestramena sectors sto disko. O skomos
einai na ta kaneis unmark wste na mhn ta blepei pia ws "bad". Pou den einai.
Afta ola einai thewrhtika fysika. Doxa tw Thew den exw problhmata me ious.

Alexios Chouchoulas          '88    ,88'   ,88'     alexios at vennea.demon.co.uk
The Unpronouncable One      ,o88oooo88ooooo88oo,              axc at dcs.ed.ac.uk

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