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Why are my Blu-Ray read/writer & External eSATA Enclosure only accessed by USB?

887 Views 10 Replies Latest reply: Mar 16, 2013 9:41 PM by japamac RSS
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Mar 12, 2013 3:15 PM

I bought a Pioneer BDR-207D Blu-Ray optical drive and a Vantec eSATA/USB 2.0 external enclosure to use with my PowerMac G5 that has a PCI SATA card installed.  For some reason I can't fathom, the optical drive only shows up for binness via USB.  So I tested the cable and card out instead with my eSATA WD MyBook drive and another eSATA drive already in use and they both show up and work just fine.


This makes no sense to me. What necessary info am I missing?


Thanks to any and all....

Mac OS X (10.5.8), Dual2 PowerMac G5, 4 GB RAM
  • BDAqua Level 10 Level 10 (114,715 points)

    Hi, just asking...


    On the G5, was the USB cable disconnected when you tried eSATA?


    What SATA speed is the card in the G5?


    What shows in System Profiler>Hardware>Serial-ATA when BD drie is connected via eSATA?

  • japamac Level 7 Level 7 (24,390 points)

    What brand/make of PCI card?

  • japamac Level 7 Level 7 (24,390 points)

    SATA PCI adapters using a SCSI "virtual environment" is common.

    It makes me think that the optical drive is then using a UDMA protocol (due to the SCSI drivers), which many SATA adapters aren't capable of or compatible with.


    An adapter like this Seritek shows support for UDMA:


    If the PCI adapter isn't UDMA compatible, it would explain why the optical drive isn't seen via eSATA.

  • japamac Level 7 Level 7 (24,390 points)

    The Pioneer is true SATA, but the PCI adapter isn't. Relying on SCSI drivers, the PCI controller adapts SATA rev 1 to the SCSI support of the system.

    Optical drives, historically, relied on UDMA to get optimal performance. With SATA, they have the bandwidth needed.

    But, the PCI adapter isn't true SATA and optical drives fall between the cracks, sometimes, in support when used with various adapters.


    OS X SCSI support for anything was greatly reduced in late 10.4 versions and almost nonexistant in 10.5. Only basic drivers that the PCI adapter makers call on remain....


    Drop 'em an email and see what Highpoint says.


    Do you think if I had an eSATA/firewire enclosure, that might provide more powerful read/write capabilities?

    FW has more efficient bandwidth than USB 2.0.

  • japamac Level 7 Level 7 (24,390 points)

    HighPoint Rocket products were so highly recommended for PCI SATA solutions for older PowerPC's like my G5

    Not odd in as much that the majority of discussions are with regard to hard drives. Hard drives and optical drives are different animals.

    Is the Seritek card you referenced earlier a true SATA?

    All the PCI cards use a SATA controller that utilizes SCSI or SCSI adapted drivers in G4 and G5 Macs.

    Ther Seritek controller is the only one that supports boot to connected drives. The controller/firmware also has UDMA support.


    As I suggested, send Highpoint support an email.

    Do the same with Seritek (regarding Blu Ray drive support).


    the thought of fake anything on my system slowing me and my work down really burns me up.

    That's just something that you will need to accept. PCI SATA uses SCSI, period.

    The G5 only has two SATA channels, no more.

  • japamac Level 7 Level 7 (24,390 points)

    it works, it's been working, and it's all been terrifically dependable!

    THAT is what is important!


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