Can I Replace/upgrade The Hard Drive In My Laptop?

Pretty much what I’m asking is, is it at all possible to get a replacement for my laptops dying hard drive? I’d really like to upgrade or get the exact same. Yes, I like to play demanding games on this critter. No I do not have an issue with lagged fps, don’t make statements that my computer is crap, I want help and I’m stating what I use it for. I want a relevant answer to replacing the hard-drive. I don’t have the money to get the desktop that I want yet so this laptop has to last me awhile longer, so please give hard drive suggestions according to my laptop specs because to tell you the truth I SUCK at hardware. That’s why I’m in the uncomfortable position of gaming with a laptop and not a desktop -sigh-. So I need some help here, and again please be kind to this PC it’s outdated, and this is the only problem I’ve had from it. I love it to bits like a favorite blanket. It’s like a pet!
Okay so system specs:
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System Information
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Time of this report: 2/16/2012, 13:07:03
Machine name: MALON50001
Operating System: Windows Vista™ Home Premium (6.0, Build 6002) Service Pack 2 (6002.vistasp2_gdr.111025-0338)
Language: Korean (Regional Setting: English)
System Manufacturer: TOSHIBA
System Model: Satellite P300
BIOS: PhoenixBIOS 4.0 Release 6.1
Processor: Intel(R) Core(TM)2 Duo CPU T9300 @ 2.50GHz (2 CPUs), ~2.5GHz
Memory: 3070MB RAM
Page File: 1603MB used, 4736MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
DxDiag Version: 7.00.6002.18107 32bit Unicode
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Display Devices
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Card name: ATI Mobility Radeon HD 3650
Manufacturer: ATI Technologies Inc.
Chip type: ATI Radeon Graphics Processor (0×9591)
DAC type: Internal DAC(400MHz)
Device Key: Enum\PCI\VEN_1002&DEV_9591&SUBSYS_FF5011…
Display Memory: 1787 MB
Dedicated Memory: 508 MB
Shared Memory: 1279 MB
Current Mode: 1440 x 900 (32 bit) (60Hz)
Monitor: Generic PnP Monitor
Driver Name: atiumdag.dll,atiumdva.dat,atitmmxx.dll
Driver Version: 7.14.0010.0555 (English)
DDI Version: 10
BGRA Supported: Yes
Driver Attributes: Final Retail
Driver Date/Size: 1/30/2008 18:16:10, 3032064 bytes
WHQL Logo’d: Yes
WHQL Date Stamp:
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Sound Devices
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Description: Speakers (Conexant High Definition SmartAudio 221)
Default Sound Playback: Yes
Default Voice Playback: Yes
Hardware ID: HDAUDIO\FUNC_01&VEN_14F1&DEV_5051&SUBSYS…
Manufacturer ID: 1
Product ID: 100
Type: WDM
Driver Name: CHDART.sys
Driver Version: 4.36.0006.0000 (English)
Driver Attributes: Final Retail
WHQL Logo’d: Yes
Date and Size: 2/1/2008 14:46:08, 187904 bytes
Other Files:
Driver Provider: Conexant
HW Accel Level: Basic
Cap Flags: 0xF1F
Min/Max Sample Rate: 100, 200000
Static/Strm HW Mix Bufs: 1, 0
Static/Strm HW 3D Bufs: 0, 0
HW Memory: 0
Voice Management: No
EAX(tm) 2.0 Listen/Src: No, No
I3DL2(tm) Listen/Src: No, No
Sensaura(tm) ZoomFX(tm): No
Description: Digital Output Device (HDMI) (High Definition Audio Device)
Default Sound Playback: No
Default Voice Playback: No
Hardware ID: HDAUDIO\FUNC_01&VEN_1002&DEV_AA01&SUBSYS…
Manufacturer ID: 1
Product ID: 100
Type: WDM
Driver Name: HdAudio.sys
Driver Version: 6.00.6002.18005 (English)
Driver Attributes: Final Retail
WHQL Logo’d: Yes
Date and Size: 4/10/2009 23:43:02, 236544 bytes
Other Files:
Driver Provider: Microsoft
HW Accel Level: Basic
Cap Flags: 0xF1F
Min/Max Sample Rate: 100, 200000
Static/Strm HW Mix Bufs: 1, 0
Static/Strm HW 3D Bufs: 0, 0
HW Memory: 0
Voice Management: No
EAX(tm) 2.0 Listen/Src: No, No
I3DL2(tm) Listen/Src: No, No
Sensaura(tm) ZoomFX(tm): No
Description: SPDIF Interface (Conexant High Definition SmartAudio 221)
Default Sound Playback: No
Default Voice Playback: No
Again I know it’s outdated, but at the end of the day it’s all I have till I can get the desktop so please be kind ♥