Le cache sous BeOS 4 ? Aucune idée (trop jeune), mais sous BeOS 5 il faut le regler manuellement (surtout qu'il y a une corruption noyau avec > 128mo de ram):
Disk cache setting
Generally, on almost all R5 installations, it's a good idea to change the disk cache settings. Failure to do this can lead to some very strange issues, including boot problems, on all systems.
To change it, move the file /boot/home/config/settings/kernel/drivers/sample/kernel to /boot/home/config/settings/kernel/drivers/ and open it in StyledEdit.
Change the line:
# disk_cache_size 2048
to:
disk_cache_size 16384
(yes, remove the # character as well)