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An IDE hard drive will appear as /dev/hd* and a Serial ATA or SCSI (or
USB/IEEE 1394 drive for that matter) will appear as /dev/sd*. The ways to set
parameters on IDE and SATA/SCSI drives are different. The IDE and SCSI/SATA
drives sometimes use different kernel modules to allow for data transfer,
although modern libata versions handle IDE and SATA modules. SCSI is a
different animal, especially Serial Attached SCSI (SAS.) It requires some
different kernel options and modules. However, you do need to enable SCSI
disk support to use SCSI, SATA, or USB mass storage devices, so I bet that
the disk drivers between IDE and SCSI/SATA/USB are different as well.
The drives behave similarly in the computer- they all can be partitioned,
mounted using the same mount commands, etc. And it is pretty likely that
people would have different kinds of drives in their computers as optical
drives are IDE and appear as /dev/hd* and hard drives are now mostly all SATA
in new builds. Here's my /etc/fstab, and you can see that I have two SATA
HDDs and two IDE optical drives:
# <fs> <mountpoint> <type> <opts>
<dump/pass>
# NOTE: If your BOOT partition is ReiserFS, add the notail option to opts.
/dev/sda1 /boot ext2 noatime 1 2
/dev/sda3 / xfs noatime 0 1
/dev/sda2 none swap sw 0 0
/dev/hda /mnt/dvd auto noauto,user 0 0
/dev/hdb /mnt/cdrom auto noauto,user 0 0
/dev/fd0 /mnt/floppy auto noauto,user 0 0
/dev/sda4 /local xfs noatime 0 2
/dev/sdb1 /home xfs noatime 0 2
In addition, I have a USB memory card reader than ivman will mount as /dev/sdc
or /dev/sdd when I stick a card into the reader, dependent on which slot I
stick the cards into. My USB thumb drive shows up as /dev/sde.
I hope this helps!
Phillip
On Friday 02 June 2006 07:56, Jennifer Dozar wrote:
> I am curious, mainly cause i was intrigued by a Linux Admin test I took
> for a job last night, and i didn't really know. One question asked
> about transferring data from an IDE drive to a SCSI drive. Can anyone
> explain this to me? I figured Linux just saw it as another hard drive,
> not necessarily a "different type" of drive. So, i'm just wondering if
> anyone can help me out with that. I haven't ever come across this, but
> doesn't mean i won't someday. how many computers actually have both
> types? don't mostly motherboards and such stick to one type of connect
> for drives?
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