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LaCie d2 Blu-ray XL Via Thunderbolt

881 Views 6 Replies Latest reply: Feb 12, 2013 2:11 AM by BB RSS
BB Level 2 Level 2 (255 points)
Currently Being Moderated
Feb 6, 2013 7:27 PM

Using a

LaCie d2 Blu-ray XL

with my 2012 imac. The drive supports Firewire 400 and USB2, utilizing the 400 to 800 firewire cable supplied I bought a Thunderbolt port and I'm only getting 3X speeds instead of 6x speeds. Am I doing something wrong?

  • BDAqua Level 10 Level 10 (114,715 points)
    Currently Being Moderated
    Feb 8, 2013 3:46 PM (in response to BB)

    Hi, what is the max rate of the Blu-Ray drive itself?

     

    I believe USB2 & FW400 are faster than most any BR drive needs. 1x Blu-ray is defined as about 36Mbps/4.5 MB/s,

    12× BR=432Mbps/54MB/s

    http://en.wikipedia.org/wiki/Blu-ray_Disc

  • crh24 Level 3 Level 3 (920 points)
    Currently Being Moderated
    Feb 11, 2013 3:00 AM (in response to BB)

    BB wrote:

     

     

    Serial ATA Interface (Rev 2.6); Data transfer rate: 1.5Gb/sec

    That is not the read speed of the drive, that is only the interface speed.  In the case of CD/DVD/Blu-ray the interface speed is several times faster than the drive actually is.  The physical transfer of the bits off of the spinning disk is the limiting factor.

     

    The speed difference between USB 2.0 and FW400 isn't all that much but FW400 uses far less cpu cycles for the data transfer.

     

    According to several sites the maximum read speed of BD on that drive is 10X (just under 45 Mbytes/sec) which is pushing the limits of USB 2.0 and FW400 but the 3X you report means something is definitely amiss somewhere in the system.  It could be a drive problem, a disk problem, or something else.

     

    With my Thunderbolt to FW800 adapter I'm getting about 170 Mbytes/sec transfer from my drives that use RAID 0 mirroring and the limiting factor is definitely the data transfer between the spinning platter(s) and the drive electronic buffer.

    late-2012 27" i7 iMac, 32GB, 3TB Fu, OS X Mountain Lion, iPad '4'; ATV3; mid 2012 MBA;

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