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[Theodoros V. Kalamatianos]

On Sat, 26 Mar 2005, Dimitris Sellakis wrote:

> Etreksa kai kapoia diagnostika tis western digital, gia tous diskous
> (oloi tous western) alla oute ekei fainete , na uparxei problima.

Legontas "diagnwstika" den pisteuw na ennoeis to Data LifeGuard ths WD e ?

Giati egw diapistwsa (me ton asxhmo tropo) oti sou vgazei disk errors mono 
otan ksemeinei apo spare sectors gia to bad sector relocation. Gia osous 
den to gnwrizoun ta IDE drives (gia ta SCSI den kserw) yposthrizoun bad 
sector remapping. Auto shmainei oti otan ena sector xtypisei einai dynaton 
o diskos na "programmatistei" (se eeprom ? on-disk data ? den kserw pws 
akrivws) wste na anakateuthinei to access pros to bad sector se ena apo 
mia seira (arxika) eleuthera kai mi prosvasima sectors.

Sta paliotera drives auto ginotan automata apo to firmware (einai to 
on-drive defect management feature, opws to leei to hdparm), alla epeidh 
etsi den htan dynaton na diasothoun ta dedomena apo to bad sector, sta nea 
drives to remapping ginetai apo ta utilities tou kataskeuasth. To provlima 
einai oti ta utils ths WD (kai endexomenws kai allwn) otan vroun bad 
sector enw yparxoun akoma spare sectors gia remapping, kanoun remapping 
diaswzontas o,ti mporoun (i.e. exeis possible corruption) kai DEN 
anaferoun lathos.

Etsi eixa ena failing drive pou mou evgaze systhmatika I/O errors (apla 
kollage to access sto disko), syxno data corruption kai molis etrexa ta 
utils ths WD oxi mono den mou evgazan error, alla kai to drive fainotan OK 
gia ligo kairo, mexri na skasei kai allo sector. E molis psiliastika ti 
ginotan den ta ksanaetreksa. Krinontas apo thn prwth apanthsh pou mou 
esteile h WD ("trekste ta utils mas na deite an einai OK o diskos") kai 
apo thn siwph ths otan tous eipa ti akrivws kanoun ta utils auta, mallon 
prospathoun etsi na glitwsoun epistrofes diskwn entos eggyhshs, 
parousiazontas failing diskous ws error-free.

An thes na deis an o diskos einai pragmati OK trekse to badblocks
se non-destructive mode (diathrei ta dedomena). Na exeis omws ypopsh sou 
oti to destructive mode einai pio apotelesmatiko, giati elegxei to disko 
me prosektika sxediasmena patterns. Gia na ftaseis sto idio bathos me non 
destructive mode xreiazesai pollapla passes (An kai se ekeinon to disko 
kai ena pass emena mou arkouse). An to badblocks vrei error, mhn trekseis 
kanena util, apo kanenan kataskeuasth kai pare ton disko gia aposyrsh, an 
eisai mes sthn eggyhsh.

Ta eikosi mou euro-lepta... (e oxi kai 0.02 euro auto to katevato)



PS: Ah to pio wraio me ta utils ths WD einai oti se mia apo tis polles 
fores pou ta etreksa (egw kai i empistosynh mou sthn WD #@!#@!2#@) mou 
evgalan kati se styl "errors were found and repaired". Tha ithela para 
poly na mathw pws sto kalo epidiorthwsan thn xtyphmenh epifaneia tou 
diskou apo software. Mind over body ena pragma ?

PS2: sorry gia to katevato, alla authn thn istoria thn thymamai kai 
neuriazw akoma...