我的光驱缓存没有认出来?怎么办?

hillhzg

[root@Nhill root]# hdparm -i /dev/hdc

/dev/hdc:

Model=DVD-ROM DVD-12X2H, FwRev=IHG5, SerialNo=
Config={ Fixed Removeable DTR<=5Mbs DTR>10Mbs nonMagnetic }
RawCHS=0/0/0, TrkSize=0, SectSize=0, ECCbytes=0
BuffType=unknown, BuffSize=0kB, MaxMultSect=0
(maybe): CurCHS=0/0/0, CurSects=0, LBA=yes, LBAsects=0
IORDY=yes, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes:  pio0 pio1 pio2 pio3 pio4
DMA modes:  mdma0 mdma1 mdma2
UDMA modes: udma0 udma1 udma2
AdvancedPM=no

hmglll

想问问,光驱也有缓存的吗?
我知道显卡要,打印机要.CPU也有二级,但我真不知道光驱也有?