Constant HDD Access by System PID 4

This process is constantly accessing and writing to my HD. It will write to the NTFS: Free Space, volume log and MFT. Is this normal activity?

I am running Win 7 on a Lenovo X61 Tablet PC.

OS Name Microsoft Windows 7 Professional
Version 6.1.7600 Build 7600
Other OS Description Not Available
OS Manufacturer Microsoft Corporation
System Manufacturer LENOVO
System Model 7764CTO
System Type X86-based PC
Processor Intel(R) Core(TM)2 Duo CPU L7500 @ 1.60GHz, 1601 Mhz, 2 Core(s), 2 Logical Processor(s)
BIOS Version/Date LENOVO 7SET37WW (1.23 ), 3/12/2009
SMBIOS Version 2.4
Windows Directory E:\Windows
System Directory E:\Windows\system32
Boot Device \Device\HarddiskVolume1
Locale United States
Hardware Abstraction Layer Version = "6.1.7600.16385"
Time Zone Eastern Standard Time
Installed Physical Memory (RAM) 3.00 GB
Total Physical Memory 2.97 GB
Available Physical Memory 2.15 GB
Total Virtual Memory 5.95 GB
Available Virtual Memory 5.07 GB
Page File Space 2.97 GB
Page File E:\pagefile.sys

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