Why does my HardDrive get faster when zeroed in DiskUtility?

Hi,
I was having some performance issues with my MacBookPro (C2D, 2,16GHz, 2GB Ram, 120GM 5400 stock drive)
My girlfriend has the same speced MBP so I could compare performance:
-Mine needed 50 secs more than hers to start Adobe Photoshop CS2!!!
-mine took 103 sec to copy a 440MB folder to the desktop (within the external drive, freshly booted system, 20GB free on HD, no USB/FW storage connceted to the computer)
Hers took 48 sec!
No wonder it felt dead slow! It even had trouble playing back small quicktime movies!!
This was a big shock to me, usually a computer tends to feel slow for psycological reasons after a while but here I could compare and be sure.
Then I did a cleaninstall incl initialising the HD before and the same folder copied in 83 secs!
After that I zeroed it once and insallted anew: 65 sec.
The I zeroed 7 times and insatlled another time: 50 sec.
(just out of curiosity, I tried it again with a 7 time zeroing and it stayed at 50 sec.)
What happens on the HD when zeroing that makes it copy the same folder quicker?
What could be the problem of my HD?
Would you suggest me to have it changed?
Will this be covered by the warranty?
Lotsa question...
regards,
André

Basically, it just sounds as if your caches were full, and when you zeroed out the disc, they emptied. Why it became faster on each zeroing out, I don't know, the first one should have been the same as all the others.
Miriam

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To: Teffanie Stark <[email protected]>
Sent: Wednesday, October 29, 2014 2:49 PM
Subject: - Why does my phone get hot at time's?
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Why does my phone get hot at time's?
created by Verizon Wireless Customer Support in Android - View the full discussion             I know this is not a good experience with your device starky69. Is there any damage to the device? How long have you had the phone? Which phone do you own? Do you keep the phone on the charger at all times when its not being used?
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Panics Since Last Report:          1
Thu Feb 6 15:29:32 2014
panic(cpu 1 caller 0xffffff80002c4794): Kernel trap at 0xffffff7f81d89ff3, type 14=page fault, registers:
CR0: 0x0000000080010033, CR2: 0xffffff7acd4a2a7c, CR3: 0x0000000085d3b000, CR4: 0x0000000000000660
RAX: 0xffffffff4bffff56, RBX: 0x0000000000000000, RCX: 0x0000000000000001, RDX: 0x0000000000000000
RSP: 0xffffff807867b7c0, RBP: 0xffffff807867b800, RSI: 0xffffff7acd4a2a7c, RDI: 0xffffff8065292000
R8: 0x0000000000000001, R9: 0x0000000000000000, R10: 0xffffff7f81d44200, R11: 0xffffff800f8b45e8
R12: 0xffffff8065292000, R13: 0xffffff807867b860, R14: 0x0000000000000001, R15: 0xffffff7acd4a2a7c
RFL: 0x0000000000010286, RIP: 0xffffff7f81d89ff3, CS: 0x0000000000000008, SS: 0x0000000000000010
CR2: 0xffffff7acd4a2a7c, Error code: 0x0000000000000000, Faulting CPU: 0x1
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0xffffff807867b470 : 0xffffff8000220792
0xffffff807867b4f0 : 0xffffff80002c4794
0xffffff807867b6a0 : 0xffffff80002da55d
0xffffff807867b6c0 : 0xffffff7f81d89ff3
0xffffff807867b800 : 0xffffff7f81d8a694
0xffffff807867b890 : 0xffffff7f81d8b4ed
0xffffff807867b8d0 : 0xffffff7f81d472a1
0xffffff807867ba40 : 0xffffff7f81d8bd6d
0xffffff807867bb00 : 0xffffff7f81d44346
0xffffff807867bb60 : 0xffffff8000655f3e
0xffffff807867bb80 : 0xffffff800065681a
0xffffff807867bbe0 : 0xffffff8000656fbb
0xffffff807867bd20 : 0xffffff80002a3f08
0xffffff807867be20 : 0xffffff8000223096
0xffffff807867be50 : 0xffffff80002148a9
0xffffff807867beb0 : 0xffffff800021bbd8
0xffffff807867bf10 : 0xffffff80002af140
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BSD process name corresponding to current thread: iPhoto
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11G63
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Darwin Kernel Version 11.4.2: Thu Aug 23 16:25:48 PDT 2012; root:xnu-1699.32.7~1/RELEASE_X86_64
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com.apple.driver.AppleHDAController    2.2.5a5
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com.apple.driver.IOPlatformPluginLegacy    5.0.0d8
com.apple.driver.IOPlatformPluginFamily    5.1.1d6
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com.apple.driver.AppleUSBBluetoothHCIController    4.0.8f17
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com.apple.iokit.IOSCSIBlockCommandsDevice    3.2.1
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com.apple.iokit.IONetworkingFamily    2.1
com.apple.iokit.IOUSBUserClient    5.0.0
com.apple.iokit.IOUSBFamily    5.1.0
com.apple.driver.NVSMU    2.2.9
com.apple.iokit.IOHIDFamily    1.7.1
com.apple.driver.AppleEFIRuntime    1.6.1
com.apple.iokit.IOSMBusFamily    1.1
com.apple.security.sandbox    177.11
com.apple.kext.AppleMatch    1.0.0d1
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com.apple.iokit.IOStorageFamily    1.7.2
com.apple.driver.AppleKeyStore    28.18
com.apple.driver.AppleACPIPlatform    1.5
com.apple.iokit.IOPCIFamily    2.7
com.apple.iokit.IOACPIFamily    1.4
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Why does my HardDrive get faster when zeroed in DiskUtility?

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