Polloi nomizoyn oti exoyn problhma, enw sthn pragmatikothta den yparxei kanena. H pisteuoyn oti ta problhmata poy exoyn ofeilontai sth gewmetria toy diskoy, enw ayto den exei na kanei tipota me to problhma toys. Ta parapanw mporei na akougontai periploka alla h gewmetria einai kati sxetika aplo: afhste thn opws einai kai ola 8a einai mia xara· h to polu na dwsete thn parametro `linear' sto LILO an den proxwraei meta to `LI' otan jekina. Prosejte ta mynhmata toy pyrhna kai 8ymh8eite: oso perissotero peirazete thn gewmetria (orizontas kefales kai kylindroys sto LILO, to fdisk kai ton pyrhna) toso pi8anotero einai na mh doylecei. Xontrika ola einai entajei apo mona toys.
Kai 8ymh8eite: poy8ena sto Linux de xrhsimopoieite h gewmetria, opote kanena problhma de mporei na dhmioyrgh8ei apo aythn. H gewmetria xrhsimopoieite mono apo to LILO kai to fdisk. Etsi, an to LILO den jekina ton pyrhna, mporei na einai problhma gewmetrias. An diaforetika leitoyrgika den katalabainoyn ton pinaka katatmhsewn, mporei na einai problhma gewmetrias. Tipota perissotero. Sygkekrimena, an to mount de doyleuei mhn anhsyxeite gia th gewmetria· to problhma einai allou.
Einai pi8ano enas diskos na labei la8os gewmetria. O pyrhnas rwta to BIOS gia ta hd0 kai hd1 (toys diskoys 80H kai 81H sumfwna me to BIOS) kai ypo8etei oti einai gia ta hda kai hdb. Alla an ekkineite apo SCSI, oi prwtoi dyo diskoi mporei na einai SCSI kai o pemptos diskos, poy einai prwtos IDE hda diskos, pairnei th gewmetria toy sda. Ayto lunetai eukola me thn parametro ekkinhshs `hda=C,H,S' me tis katallhles times C, H kai S, eite kata thn ekkinhsh h sto /etc/lilo.conf.
`Exw dyo omoioys diskoys 10GB IBM. To fdisk dinei diaforetiko mege8os ston ka8ena. Deite:
# fdisk /dev/hdb
Disk /dev/hdb: 255 heads, 63 sectors, 1232 cylinders
Units = cylinders of 16065 * 512 bytes
Device Boot Start End Blocks Id System
/dev/hdb1 1 1232 9896008+ 83 Linux native
# fdisk /dev/hdd
Disk /dev/hdd: 16 heads, 63 sectors, 19650 cylinders
Units = cylinders of 1008 * 512 bytes
Device Boot Start End Blocks Id System
/dev/hdd1 1 19650 9903568+ 83 Linux native
Ti symbainei edw; Prwta apo ola, oi diskoi einai pragmati 10GB: to hdb exei mege8os 255*63*1232*512 = 10133544960, kai to hdd 16*63*19650*512 = 10141286400, etsi tipota de symbainei kai o pyrhnas toys blepei kai toys duo san 10.1 GB. Giati h diafora sto mege8os; Ayto symbainei epeidh o pyrhnas pairnei tis plhrofories gia toys prwtoys dyo IDE diskoys apo to BIOS, kai to BIOS exei balei ston hdb 255 kefales (kai 16*19650/255=1232 cylinders). H stroggylopoihsh kostizei sxedon 8MB.
An 8elete mporeite na allajete ton hdd me ton idio tropo kai na dwsete ston pyrhna kata thn ekkinhsh `hdd=1232,255,63'.
To fdisk 8a sas pei posa temaxia (blocks) yparxoyn ston disko. An dhmioyrghsete susthma arxeiwn, p.x. me to mke2fs, tote to susthma krata ligo xwro gia logoys diaxeirishs· peripoy 4% toy synolikou xwroy, perissotero an 8elete polla inodes. Gia paradeigma:
# sfdisk -s /dev/hda9
4095976
# mke2fs -i 1024 /dev/hda9
mke2fs 1.12, 9-Jul-98 for EXT2 FS 0.5b, 95/08/09
...
204798 blocks (5.00%) reserved for the super user
...
# mount /dev/hda9 /somewhere
# df /somewhere
Filesystem 1024-blocks Used Available Capacity Mounted on
/dev/hda9 3574475 13 3369664 0% /mnt
# df -i /somewhere
Filesystem Inodes IUsed IFree %IUsed Mounted on
/dev/hda9 4096000 11 4095989 0% /mnt
#
# mke2fs /dev/hda9
# mount /dev/hda9 /somewhere
# df /somewhere
Filesystem 1024-blocks Used Available Capacity Mounted on
/dev/hda9 3958475 13 3753664 0% /mnt
# df -i /somewhere
Filesystem Inodes IUsed IFree %IUsed Mounted on
/dev/hda9 1024000 11 1023989 0% /mnt
#