Getting Information about the Hard drive and list all PCI devices.

$ hdparm /dev/hda

/dev/hda:
multcount    = 16 (on)
IO_support   =  0 (default 16-bit)
unmaskirq    =  0 (off)
using_dma    =  1 (on)
keepsettings =  0 (off)
readonly     =  0 (off)
readahead    = 256 (on)
geometry     = 16383/255/63, sectors = 234375000, start = 0

or for SCSI

$ hdparm /dev/sda

Try it with the -i option for information

$ hdparm -i /dev/hda

/dev/hda:

Model=IC35L120AVV207-1, FwRev=V24OA66A, SerialNo=VNVD09G4CZ6E0T
Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=52
BuffType=DualPortCache, BuffSize=7965kB, MaxMultSect=16, MultSect=16
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=234375000
IORDY=on/off, tPIO={min:240,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 udma3 udma4 *udma5
AdvancedPM=yes: disabled (255) WriteCache=enabled
Drive conforms to: ATA/ATAPI-6 T13 1410D revision 3a:  2 3 4 5 6

How fast is your drive?

$ hdparm -tT /dev/hda

/dev/hda:
Timing buffer-cache reads:   128 MB in  0.41 seconds =315.32 MB/sec
Timing buffered disk reads:  64 MB in  1.19 seconds = 53.65 MB/sec

Need to find your device?

$ mount
or
$ cat /proc/partitions
or
$ dmesg | egrep '^(s|h)d'

which for my system lists:

hda: IC35L120AVV207-1, ATA DISK drive
hdc: Lite-On LTN486S 48x Max, ATAPI CD/DVD-ROM drive
hda: max request size: 1024KiB
hda: 234375000 sectors (120000 MB) w/7965KiB Cache, CHS=16383/255/63, UDMA(100)

By the way, if you want to turn on dma

$ hdparm -d1 /dev/hda
setting using_dma to 1 (on)
using_dma    =  1 (on)

(Also see TIP 122 )

List all PCI devices

$ lspci -v

00:00.0 Host bridge: Intel Corp. 82845G/GL [Brookdale-G] Chipset Host Bridge (rev
Subsystem: Dell Computer Corporation: Unknown device 0160
Flags: bus master, fast devsel, latency 0
Memory at f0000000 (32-bit, prefetchable) [size=128M]
Capabilities: <available only to root>

... lots more ...

Note, there is also lspci -vv for even more information.