Problems with external HD

Salve!

I've got problems with an external firewire/usb hard drive case (version
details see below). When I just plug in the firewire cable, the drive is
sometimes not recognised. I have to plug in the usb cable as well and then
unplug/plug those two cables, sometimes multiple times. I still haven't found
out in which order exactly, to make it work.

My first guess was, as the case comes with a 6-6 firewire cable and I use a
6-4 cable, that the electronic of the case also needs the power supply
through firewire or usb. But as I can pull the usb plug as soon as the drive
has been recognised through firewire and it still works, this cannot be the
case.

My question now is: how can I find out what's going wrong? I want to know, if
it is a problem with the hd case electronic or with the linux ieee1394
drivers.

Thanks in advance and best regards
Alexej

Details:
Kernel: 2.4.22 (no ieee1394 patches)
libraw: 0.10.1

---
Output of cat /proc/bus/ieee1394/devices (the 2nd device is my hd, when it is 
recognised):
Node[0-01:1023]  GUID[384fc00030723810]:
  Vendor ID: `Linux OHCI-1394' [0x000000]
  Capabilities: 0x0083c0
  Bus Options:
    IRMC(1) CMC(1) ISC(1) BMC(0) PMC(0) GEN(0)
    LSPD(2) MAX_REC(2048) CYC_CLK_ACC(0)
  Host Node Status:
    Host Driver     : ohci1394
    Nodes connected : 2
    Nodes active    : 2
    SelfIDs received: 2
    Irm ID          : [0-01:1023]
    BusMgr ID       : [0-63:1023]
    In Bus Reset    : no
    Root            : yes
    Cycle Master    : yes
    IRM             : yes
    Bus Manager     : no
Node[0-00:1023]  GUID[005077350710020e]:
  Vendor ID: `Prolific PL3507 Combo Device' [0x005077]
  Capabilities: 0x0083c0
  Bus Options:
    IRMC(0) CMC(0) ISC(0) BMC(0) PMC(0) GEN(0)
    LSPD(0) MAX_REC(64) CYC_CLK_ACC(255)
  Unit Directory 0:
    Vendor/Model ID: Prolific PL3507 Combo Device [005077] / (1394-ATAPI 
rev1.10) [000001]
    Software Specifier ID: 00609e
    Software Version: 010483
    Driver: SBP2 Driver
    Length (in quads): 8
---
ieee1394 controller (from lspci -vv):
02:01.2 FireWire (IEEE 1394): Texas Instruments PCI4451 IEEE-1394 Controller 
(prog-if 10 [OHCI])
        Subsystem: Dell Computer Corporation: Unknown device 00d4
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- 
Stepping- SERR+ FastB2B-
        Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- 
<TAbort- <MAbort- >SERR- <PERR+
        Latency: 32 (500ns min, 1000ns max), cache line size 08
        Interrupt: pin A routed to IRQ 9
        Region 0: Memory at f8fff000 (32-bit, non-prefetchable) [size=2K]
        Region 1: Memory at f8ff8000 (32-bit, non-prefetchable) [size=16K]
        Capabilities: [44] Power Management version 2
                Flags: PMEClk- DSI- D1- D2+ AuxCurrent=0mA PME(D0-,D1-,D2
+,D3hot+,D3cold-)
                Status: D0 PME-Enable- DSel=0 DScale=0 PME-
---
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