HT1948 Does the macbook use the internal harddrive when booting from usb and when fully booted?

I wonder if the Macbook Air uses the internal SSD drive when booting Mac OSX lion 10.8.2 from a bootable USB stick?
I am suspecting the internal harddrive is faulty because it gives me random system freeze ups during normal use, making me hold the power button to shut it down. So I'm wondering if I boot my macbook from a bootable USB, if the internal drive is used for caching or anything?

What i'm doing when it freezes is totally random. I am not having any programs open, but for example just clicking on the apple icon or starting up safari, there seems to be no specific program that crashes it. I'm still running without a freeze up after I fixed the drive permissions with Disk Utility. But here is Etrecheck;
Hardware Information:
MacBook Air - model: MacBookAir2,1
1 1.86 GHz Intel Core 2 Duo CPU: 2 cores
2 GB RAM
System Software:
OS X 10.8.2 (12C60) - Uptime: 0 days 0:9
Disk Information:
APPLE SSD SM128 disk0 : (121,33 GB)
disk0s1 (disk0s1) <not mounted>: 209,7 MB
MacBook Air (disk0s2) /: 120,47 GB (106,36 GB free)
Recovery HD (disk0s3) <not mounted>: 650 MB
USB Information:
Apple Inc. Built-in iSight
Apple Inc. Apple Internal Keyboard / Trackpad
Apple Computer, Inc. IR Receiver
Apple Inc. BRCM2046 Hub
Apple Inc. Bluetooth USB Host Controller
FireWire Information:
Kernel Extensions:
Problem System Launch Daemons:
Problem System Launch Agents:
       [failed] com.apple.afpstat.plist
       [failed] com.apple.mrt.uiagent.plist
Launch Daemons:
   [not loaded] com.bjango.istatmenusdaemon.plist
Launch Agents:
       [loaded] com.bjango.istatmenusagent.plist
User Launch Agents:
User Login Items:
iTunesHelper
3rd Party Preference Panes:
None
Internet Plug-ins:
JavaAppletPlugin.plugin
QuickTime Plugin.plugin
User Internet Plug-ins:
Bad Fonts:
None
Top Processes:

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Welcome to Apple Support Communities
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I want to install leopard on my old macbook using the disc i got by my Macbook Pro
specs of macbook wich i can't install leopard on:
Modelnaam: MacBook
Modelaanduiding: MacBook1,1
Processornaam: Intel Core Duo
Processorsnelheid: 2 GHz
Aantal processors: 1
Totaal aantal cores: 2
L2-cache (per processor): 2 MB
Geheugen: 1 GB
Bussnelheid: 667 MHz
Opstart-ROM-versie: MB11.0061.B03
SMC-versie: 1.4f12
Serienummer: 4H627A89VMM
Btw the format of hardisk in macbook is Journaled HFS+ and Tiger 10.4.11 installed
specs of macbook pro wich leopard installdisc i'm using to install leopard
Modelnaam: MacBook Pro
Modelaanduiding: MacBookPro3,1
Processornaam: Intel Core 2 Duo
Processorsnelheid: 2.2 GHz
Aantal processors: 1
Totaal aantal cores: 2
L2-cache: 4 MB
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Bussnelheid: 800 MHz
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SMC-versie: 1.16f10
Serienummer: W88037KYX91
(on macbook pro leopard succesfully installed)
I don't see the problem and can't find it anywhere, hopefully you know it.
Thanks,
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Message was edited by: Klapschaats

Klapschaats,
Unfortunately, the installation media that comes with your Mac will only work with that particular machine. These installation discs are not the same as a retail copy of Leopard. The retail installation disc can be installed on any supported machine. The installation media that came with your Macbook Pro for example has data on it meant only for that machine. Think of it also as something like an "OEM" disc for Windows when you purchase a machine from Dell. That particular installation disc is licensed only for that machine and contains files specifically for that machine.

HT1948 Does the macbook use the internal harddrive when booting from usb and when fully booted?

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