voila les infos que j'ai obtenu :
[root@localhost root]# hdparm -I /dev/hdb
/dev/hdb:
ATAPI CD-ROM, with removable media
Model Number: SAMSUNG DVD-ROM SD-616F
Serial Number:
Firmware Revision: F100
Standards:
Used: ATAPI for CD-ROMs, SFF-8020i, r2.5
Supported: CD-ROM ATAPI-2
Configuration:
DRQ response: 50us.
Packet size: 12 bytes
Capabilities:
LBA, IORDY(cannot be disabled)
DMA: *sdma0 sdma1 sdma2 mdma0 mdma1 mdma2 udma0 udma1 udma2
Cycle time: min=120ns recommended=120ns
PIO: pio0 pio1 pio2 pio3 pio4
Cycle time: no flow control=120ns IORDY flow control=120ns