Multiple Apple TVs cause Kernel Panic

Hey everyone... need a little help with something.
I have the following setup.
MacBook Pro 2.4GHz dual core connected via ethernet to AEBS.
2TB external drive connected via USB to AEBS.
iTunes library media folder is located on external drive, but library files are located on laptop.
I have two second generation Apple TVs (one upstairs, one downstairs).
When using both Apple TVs to watch movies from the iTunes library my laptop will kernel panic after about 10 minutes.  It happens everytime without fail. However, if using one to watch a movie and another to watch say netflix, all is fine.  Same with renting movies or watching MLB.com or streaming music or listening to the radio--all works flawlessly until I try to access my movie collection via Home Sharing from both Apple TVs.  Tried watching the same movie or different movies--either way I crash.
Running latest software update with latest version of iTunes and Snow Leopord.  Disk Utility found no problems and permissions are up to date/repaired.
Any ideas?  Is this kind of demand on the HDD frowned upon?  Anyone else try this?

Thanks for your help both of you--we might be getting somewhere.
I understand that the problem wouldn't be just like running a USB cord directly to the computer--but can the connection that IS there really not handle ~20MB/s like I mentioned?  If not--thats pretty pathetic.  But like you guys mentioned; its possible that it isn't the demand which would cause a panic--that would more cause stuttering or buffering issues...
If drive is connected directly to the laptop, via firewire or usb--no problems.  Its just when its connected to the AEBS.  Like mentioned--there may be a bottleneck of some sort.  Apart from sending the crash reports to Apple [which they have like 10 of them by now :-)] is there any way I can look through the log to see what caused the panic?  I wouldn't even know what to look for much less how to interpret it but if there is a set of words or phrases I can seek out which would be clues?

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    Finally here are a few of the recent crashes I hope that someone might be able to shed some light on this extremely frustrating problem for me.
    Tue Oct 25 18:54:16 2011
    panic(cpu 0 caller 0x000AE584): "Uncorrectable machine check: pc = 00000000000A388C, msr = 0000000000141000, dsisr = 42000000, dar = 0000000000272008\n" "  AsyncSrc = 0000000000000000, CoreFIR = 0000000000000000\n" "     L2FIR = 0000000000000000,  BusFir = 0000000080000000\n"@/SourceCache/xnu/xnu-1228/osfmk/ppc/trap.c:975
    Latest stack backtrace for cpu 0:
          Backtrace:
             0x0009AD18 0x0009B6BC 0x00029DC4 0x000AE584 0x000AE804 0x000B22F8
    Proceeding back via exception chain:
       Exception state (sv=0x2fc12c80)
          PC=0x000A388C; MSR=0x00141000; DAR=0x00272008; DSISR=0x42000000; LR=0x000A37C8; R1=0x2E947B40; XCP=0x00000008 (0x200 - Machine check)
          Backtrace:
    0x00000000 0x000A09C8 0x0009E2EC 0x0006B3C0 0x0006C728 0x0003BE1C
             0x0029361C 0x0029364C 0x0030924C 0x000B24C8 0x00000000
       Exception state (sv=0x249dba00)
          PC=0x9195435C; MSR=0x0000F030; DAR=0x00272000; DSISR=0x42000000; LR=0x00001FA8; R1=0xBFFFFB00; XCP=0x00000030 (0xC00 - System call)
    BSD process name corresponding to current thread: PubSubAgent
    Mac OS version:
    9A581
    Kernel version:
    Darwin Kernel Version 9.0.0: Tue Oct  9 21:37:58 PDT 2007; root:xnu-1228~1/RELEASE_PPC
    Tue Oct 25 19:09:54 2011
    Unresolved kernel trap(cpu 0): 0x300 - Data access DAR=0x00000000FFFFFFFF PC=0x0000000000040DE4
    Latest crash info for cpu 0:
       Exception state (sv=0x3c19ca00)
          PC=0x00040DE4; MSR=0x00001030; DAR=0xFFFFFFFF; DSISR=0x40000000; LR=0x00040D94; R1=0x33B63D50; XCP=0x0000000C (0x300 - Data access)
          Backtrace:
    0x0293EA14 0x0004147C 0x0001EB60 0x00025960 0x000B264C 0x00000000
    Proceeding back via exception chain:
       Exception state (sv=0x3c19ca00)
          previously dumped as "Latest" state. skipping...
       Exception state (sv=0x3297b500)
          PC=0x919419D8; MSR=0x0000D030; DAR=0x0073C000; DSISR=0x42000000; LR=0x91948900; R1=0xF00807A0; XCP=0x00000030 (0xC00 - System call)
    BSD process name corresponding to current thread: mdworker
    Mac OS version:
    9A581
    Kernel version:
    Darwin Kernel Version 9.0.0: Tue Oct  9 21:37:58 PDT 2007; root:xnu-1228~1/RELEASE_PPC
    panic(cpu 0 caller 0xFFFF0003): copyin/out has no recovery point
    Latest stack backtrace for cpu 0:
          Backtrace:
             0x0009AD18 0x0009B6BC 0x00029DC4 0x000AEB88 0x000B22F8
    Proceeding back via exception chain:
       Exception state (sv=0x3c19ca00)
          PC=0x00040DE4; MSR=0x00001030; DAR=0xFFFFFFFF; DSISR=0x40000000; LR=0x00040D94; R1=0x33B63D50; XCP=0x0000000C (0x300 - Data access)
          Backtrace:
    0x0293EA14 0x0004147C 0x0001EB60 0x00025960 0x000B264C 0x00000000
       Exception state (sv=0x3297b500)
          PC=0x919419D8; MSR=0x0000D030; DAR=0x0073C000; DSISR=0x42000000; LR=0x91948900; R1=0xF00807A0; XCP=0x00000030 (0xC00 - System call)
    BSD process name corresponding to current thread: mdworker
    Wed Oct 26 15:31:02 2011
    Unresolved kernel trap(cpu 0): 0x300 - Data access DAR=0x00000000FFFFFFFF PC=0x0000000000040DE4
    Latest crash info for cpu 0:
       Exception state (sv=0x3c19ca00)
          PC=0x00040DE4; MSR=0x00001030; DAR=0xFFFFFFFF; DSISR=0x40000000; LR=0x00040D94; R1=0x33B63D50; XCP=0x0000000C (0x300 - Data access)
          Backtrace:
    0x0293EA14 0x0004147C 0x0001EB60 0x00025960 0x000B264C 0x00000000
    Proceeding back via exception chain:
       Exception state (sv=0x3c19ca00)
          previously dumped as "Latest" state. skipping...
       Exception state (sv=0x3297b500)
          PC=0x919419D8; MSR=0x0000D030; DAR=0x0073C000; DSISR=0x42000000; LR=0x91948900; R1=0xF00807A0; XCP=0x00000030 (0xC00 - System call)
    BSD process name corresponding to current thread: mdworker
    Mac OS version:
    9A581
    Kernel version:
    Darwin Kernel Version 9.0.0: Tue Oct  9 21:37:58 PDT 2007; root:xnu-1228~1/RELEASE_PPC
    panic(cpu 0 caller 0xFFFF0003): copyin/out has no recovery point
    Latest stack backtrace for cpu 0:
          Backtrace:
             0x0009AD18 0x0009B6BC 0x00029DC4 0x000AEB88 0x000B22F8
    Proceeding back via exception chain:
       Exception state (sv=0x3c19ca00)
          PC=0x00040DE4; MSR=0x00001030; DAR=0xFFFFFFFF; DSISR=0x40000000; LR=0x00040D94; R1=0x33B63D50; XCP=0x0000000C (0x300 - Data access)
          Backtrace:
    0x0293EA14 0x0004147C 0x0001EB60 0x00025960 0x000B264C 0x00000000
       Exception state (sv=0x3297b500)
          PC=0x919419D8; MSR=0x0000D030; DAR=0x0073C000; DSISR=0x42000000; LR=0x91948900; R1=0xF00807A0; XCP=0x00000030 (0xC00 - System call)
    BSD process name corresponding to current thread: mdworker
    Wed Oct 26 22:17:42 2011
    Unresolved kernel trap(cpu 0): 0x300 - Data access DAR=0x0000000000000010 PC=0x0000000000082EF8
    Latest crash info for cpu 0:
       Exception state (sv=0x2514ea00)
          PC=0x00082EF8; MSR=0x00009030; DAR=0x00000010; DSISR=0x40000000; LR=0x00082ECC; R1=0x24F6BB60; XCP=0x0000000C (0x300 - Data access)
          Backtrace:
    0x00000000 0x000848C0 0x00077BD0 0x0007823C 0x0007920C 0x0006B718
             0x0006C728 0x00296378 0x0030924C 0x000B24C8 0x00000000
    Proceeding back via exception chain:
       Exception state (sv=0x2514ea00)
          previously dumped as "Latest" state. skipping...
       Exception state (sv=0x2509d500)
          PC=0x9194AF64; MSR=0x0000D930; DAR=0xE1000000; DSISR=0x42000000; LR=0x9194CC90; R1=0xBFFFE9A0; XCP=0x00000030 (0xC00 - System call)
    BSD process name corresponding to current thread: launchd
    Mac OS version:
    9A581
    Kernel version:
    Darwin Kernel Version 9.0.0: Tue Oct  9 21:37:58 PDT 2007; root:xnu-1228~1/RELEASE_PPC
    panic(cpu 0 caller 0xFFFF0003): 0x300 - Data access
    Latest stack backtrace for cpu 0:
          Backtrace:
             0x0009AD18 0x0009B6BC 0x00029DC4 0x000AEA90 0x000B22F8
    Proceeding back via exception chain:
       Exception state (sv=0x2514ea00)
          PC=0x00082EF8; MSR=0x00009030; DAR=0x00000010; DSISR=0x40000000; LR=0x00082ECC; R1=0x24F6BB60; XCP=0x0000000C (0x300 - Data access)
          Backtrace:
    0x00000000 0x000848C0 0x00077BD0 0x0007823C 0x0007920C 0x0006B718
             0x0006C728 0x00296378 0x0030924C 0x000B24C8 0x00000000
       Exception state (sv=0x2509d500)
          PC=0x9194AF64; MSR=0x0000D930; DAR=0xE1000000; DSISR=0x42000000; LR=0x9194CC90; R1=0xBFFFE9A0; XCP=0x00000030 (0xC00 - System call)
    BSD process name corresponding to current thread: launchd
    Thu Oct 27 11:28:35 2011
    Unresolved kernel trap(cpu 0): 0x300 - Data access DAR=0x0000000000000004 PC=0x00000000000848E0
    Latest crash info for cpu 0:
       Exception state (sv=0x248ff500)
          PC=0x000848E0; MSR=0x00009030; DAR=0x00000004; DSISR=0x42000000; LR=0x000848AC; R1=0x30063BB0; XCP=0x0000000C (0x300 - Data access)
          Backtrace:
    0x000848C0 0x00077BD0 0x0007823C 0x0007920C 0x0006B718 0x0006C728
             0x00296378 0x0030924C 0x000B24C8 0x00000000
    Proceeding back via exception chain:
       Exception state (sv=0x248ff500)
          previously dumped as "Latest" state. skipping...
       Exception state (sv=0x248fd280)
          PC=0x9194AF64; MSR=0x0000D030; DAR=0xE1000000; DSISR=0x42000000; LR=0x9194CC90; R1=0xBFFFE7F0; XCP=0x00000030 (0xC00 - System call)
    BSD process name corresponding to current thread: launchd
    Mac OS version:
    9A581
    Kernel version:
    Darwin Kernel Version 9.0.0: Tue Oct  9 21:37:58 PDT 2007; root:xnu-1228~1/RELEASE_PPC
    panic(cpu 0 caller 0xFFFF0003): 0x300 - Data access
    Latest stack backtrace for cpu 0:
          Backtrace:
             0x0009AD18 0x0009B6BC 0x00029DC4 0x000AEA90 0x000B22F8
    Proceeding back via exception chain:
       Exception state (sv=0x248ff500)
          PC=0x000848E0; MSR=0x00009030; DAR=0x00000004; DSISR=0x42000000; LR=0x000848AC; R1=0x30063BB0; XCP=0x0000000C (0x300 - Data access)
          Backtrace:
    0x000848C0 0x00077BD0 0x0007823C 0x0007920C 0x0006B718 0x0006C728
             0x00296378 0x0030924C 0x000B24C8 0x00000000
       Exception state (sv=0x248fd280)
          PC=0x9194AF64; MSR=0x0000D030; DAR=0xE1000000; DSISR=0x42000000; LR=0x9194CC90; R1=0xBFFFE7F0; XCP=0x00000030 (0xC00 - System call)
    BSD process name corresponding to current thread: launchd
    Thanks in advance,
    Max

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