84,488,480 programs installed

Should I remove Smart Defrag 3?

What percent of users and experts removed it?
25% remove it75% keep it
Overall Sentiment
What do people think about it?
(click star to rate)
How common is it?
Global Rank #527
United States Rank #595
Reach 1.2643%
Lifespan of installation (until removal)
< 21.64 days
638.41 days >
Average installed length: 335.44 days


3.3 29.07%
3.2 22.03%
3.1 27.72%
3.0 21.18%

Typically installed together

Other programs by IObit

Smart Defrag 3

What is Smart Defrag 3?  (from IObit)

Disk fragmentation is generally main cause of slow and unstable computer performance. Smart Defrag 3 helps defragment your hard drive more efficiently and optimize your disk performance. Smart Defrag 3 is a FREE, light, and stable disk defragment tool that provides efficient defragmentation to hard drives for faster fi...  Read more


Smart Defrag 3 is a software program developed by IObit. The most common release is 3.3, with over 98% of all installations currently using this version. During setup, the program creates a startup registration point in Windows in order to automatically start when any user boots the PC. A scheduled task is added to Windows Task Scheduler in order to launch the program at various scheduled times (the schedule varies depending on the version). The software is designed to connect to the Internet and adds a Windows Firewall exception in order to do so without being interfered with. The primary executable is named smartdefrag.exe. The setup package generally installs about 52 files and is usually about 18.9 MB (19,817,554 bytes). The installed file AutoUpdate.exe is the auto-update component of the program which is designed to check for software updates and notify and apply them when new versions are discovered. Relative to the overall usage of users who have this installed on their PCs, most are running Windows 7 (SP1) and Windows 10. While about 47% of users of Smart Defrag 3 come from the United States, it is also popular in United Kingdom and Germany.

Program detailsProgram details

URL: www.iobit.com
Installation folder: C:\Program Files\IObit\Smart Defrag 3\
Uninstaller: "C:\Program Files\IObit\Smart Defrag 3\unins000.exe"
Estimated size: 18.9 MB

Program filesFiles installed by Smart Defrag 3

Program executable:smartdefrag.exe
Name:Smart Defrag
Smart Defrag v3
Signed by:IObit Information Technology
Path:C:\Program Files\iobit\smart defrag 3\smartdefrag.exe
Smart Defrag v2 is a common module used by a number of IObit products.
Additional files:
  • RegisterCom.dll - IObit Register Dynamic Link Library
  • taskMgr.dll - Task Scheduler Dynamic Link Library
  • OFCommon.dll - Advanced SystemCare Ultimate (IObit Library)
  • ActionCenterDownloader.exe - Advanced SystemCare 7 (Action Center Downloader)
  • SDFreeBigUpgradeIS.exe - UpgradeTip for SD3 (Show new Smart Defrag function)
  • SD_FreeSoftwareDownloader.exe - IObit Downloader
  • defragsetup.exe - Smart Defrag 3 (Smart Defrag v3)
  • defragsetup311-pro.exe
  • defragsetup321-pro.exe
  • defragsetup330-pro.exe
  • defragsetup-pro.exe
  • Smart_Defrag_v3.1.0.319.exe
  • Smart_Defrag_v3.2.0.332.exe
  • smartdefrag-3-free.exe
  • smart-defrag-v3.exe
  • AutoUpdate.exe - Smart Defrag (Smart Defrag Updater)
  • AutoUpdate_IObitDel.exe
  • IObit SmartDefrag.exe
  • SDInit.exe - Configuring Smart Defrag
  • SDSendBugReport.exe - Send Bug Report
  • SDToolTips.exe - Smart Defrag Tooltips
  • SmartDefrag_IObitDel.exe
  • SDDriverMgr.dll - SDDriverMgr
  • SDFreeBigUpgrade.exe - UpgradeTip
  • SDProBigUpgrade.exe
  • SDUpgrate.exe - SDUpgrate (Smart Defrag BigUpgrate)
  • FixPlugin.exe
  • sdcore.dll - sdcore
  • sdcore_IObitDel.dll
  • sdlib.dll - sdlib
  • sdlib_IObitDel.dll
  • UninstallPromote.exe
  • NtfsData.dll
  • unins000.exe - Setup/Uninstall

Program behaviorsBehaviors exhibited

3 Scheduled Tasks
  • SmartDefrag.exe is scheduled as a task named 'SmartDefrag - Smart Defrag 3'.
  • AutoUpdate.exe is scheduled as a task named 'SmartDefrag3_Update'.
  • IObit SmartDefrag.exe is scheduled as a task named 'SmartDefrag' (runs weekly on Saturdays at 22:00).
3 Scheduled Tasks (Boot/Login)
  • SmartDefrag.exe is automatically launched at startup through a scheduled task named SmartDefrag_Startup.
  • AutoUpdate.exe is automatically launched at startup through a scheduled task named SmartDefragUpdate.
  • IObit SmartDefrag.exe is automatically launched at startup through a scheduled task named AutoSmartDefrag.
Startup File (User Run)
  • SmartDefrag.exe is loaded in the current user (HKCU) registry as an auto-starting executable named 'Smart Defrag 3' and executes as "C:\Program Files\IObit\Smart Defrag 3\SmartDefrag.exe".
Startup File (All Users Run)
  • SmartDefrag.exe is loaded in the all users (HKLM) registry as a startup file name 'SmartDefrag3' which loads as "C:\Program Files\IObit\Smart Defrag 3\SmartDefrag.exe" /STARTUP.
2 Windows Firewall Allowed Programs
  • SmartDefrag.exe is added as a firewall exception for 'C:\Program Files\IObit\Smart Defrag 3\SmartDefrag.exe'.
  • unins000.exe is added as a firewall exception for 'C:\Program Files\IObit\Smart Defrag 2\unins000.exe'.

Program resource utilizationResource utilization averages

Memory:23.91 MB
21.09 MB average
Total CPU:0.0089071682%
0.031193% average
Kernel CPU:0.00418673%
0.016088% average
User CPU:0.00472044%
0.015104% average
CPU cycles/sec:5,983,179
8,062,084 average
70 average
I/O reads/min:27.01 KB
435.61 KB average
I/O writes/min:875 Bytes
105.02 KB average

How do I remove Smart Defrag 3?

You can uninstall Smart Defrag 3 from your computer by using the Add/Remove Program feature in the Window's Control Panel.
  1. On the Start menu (for Windows 8, right-click the screen's bottom-left corner), click Control Panel, and then, under Programs, do one of the following:
    • Windows Vista/7/8/10: Click Uninstall a Program.
    • Windows XP: Click Add or Remove Programs.
  2. When you find the program Smart Defrag 3, click it, and then do one of the following:
    • Windows Vista/7/8/10: Click Uninstall.
    • Windows XP: Click the Remove or Change/Remove tab (to the right of the program).
  3. Follow the prompts. A progress bar shows you how long it will take to remove Smart Defrag 3.

Win 7 (SP1) 57%
Win 10 0%
Automatically starts? Yes
(Found in the run registry)
Uninstall it 25%
Keep it 75%

Windows OS versionsWindows

Which Windows OS versions does it run on?
Windows 7 59.64%
Windows 10 29.12%
Windows XP 5.81%
Windows Vista 5.40%
Windows Server 2003 0.03%
Which OS releases does it run on?
Windows 7 Home Premium 33.27%
Windows 7 Ultimate 14.52%
Windows 8.1 13.32%
Windows 7 Professional 9.14%
Microsoft Windows XP 5.77%
Windows 8.1 Pro 5.76%

Distribution by countryGeography

46.90% of installs come from the United States
Which countries install it?
  United States 46.90%
  United Kingdom 6.22%
  Germany 5.24%
  Canada 3.57%
  Italy 3.14%
  Brazil 2.40%
  Australia 2.14%
  Netherlands 1.92%
  France 1.86%
  Sweden 1.42%
  Czech Republic 1.42%
  Finland 1.35%
  Belgium 1.21%
  India 0.97%

OEM distributionPC manufacturers

What PC manufacturers (OEMs) have it installed?
Hewlett-Packard 28.28%
Acer 20.07%
Dell 19.57%
ASUS 9.43%
Toshiba 7.56%
Samsung 3.42%
Lenovo 3.36%
Intel 1.31%
American Megatrends 0.99%
Sahara 0.73%
Common models
HP Pavilion dv6 Notebook ... 5.58%
HP Pavilion g6 Notebook P... 5.56%
HP Pavilion dv7 Notebook ... 5.29%
HP Pavilion g7 Notebook P... 3.52%
HP 2000 Notebook PC 2.88%
ASUS All Series 2.68%

About (from IObit)

Founded in 2004 by two creative and enthusiastic programmers, IObit is focused on providing consumers with innovative and comprehensive system utilities and security software for superior PC performance and security.
Publisher URL: www.iobit.com

comments1 comment

user comment
user comment
Nascar68117over a year ago
If Windows 7 v9 runs its own Defrag regularly ,why would us Window 7 users down load it?????