My macbook freezes whenever I connect external HDD or USB pen.

My macbook freezes everytime I plug my USB pen or my external HDD, however if I reboot it and keep the USB pen/ext HD plugged it will work just fine.
Can you guys help me because it's really frustrating having to turn the computer off everytime I need to copy sth to my USB pen/Ext HDD.
Many thanks.

Hi fol10,
If you are having unusual USB behavior, you may want to start by resetting the System Management Controller (SMC) and PRAM, as outlined in the following articles
Intel-based Macs: Resetting the System Management Controller (SMC) - Apple-support
OS X Mavericks: Reset your computer’s PRAM
You may also want to see if this behavior happens with every USB port on the Mac, or just a specific one.
Regards,
- Brenden

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panic(cpu 1 caller 0x001A8C8A): Kernel trap at 0x005d2fab, type 14=page fault, registers:
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com.apple.iokit.IOSCSIBlockCommandsDevice(2.0.2)@0x617000->0x62cfff
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dependency: com.apple.iokit.IOStorageFamily(1.5.2)@0x5ff000
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BSD process name corresponding to current thread: kernel_task
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9C7010
Kernel version:
Darwin Kernel Version 9.2.2: Tue Mar 4 21:17:34 PST 2008; root:xnu-1228.4.31~1/RELEASE_I386
System model name: MacBookPro3,1 (Mac-F4**BC)

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EtreCheck version: 1.9.11 (43) - report generated June 15, 2014
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    MacBook Pro - model: MacBookPro5,5
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Video Information:
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        BKPNTFS (disk1s2) <not mounted>: 56.9 GB
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         4% activitymonitord
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    111 MB Google Chrome
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Thread continues as an OSX discussion here, please do not reply this.

My macbook freezes whenever I connect external HDD or USB pen.

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