Justin Alias,
ALWAYS had great results from Smart Defrag! Having been using it for years, with nothing but good results. Definitely makes file access faster!

Justin Alias, just installed it on windows 10 laptop and it does offer a normally unwanted program before install begins, it also uses social engineering big green subscribe button and tiny standard link for no thanks where they try and get you to give them your email address to subscribe to a newsletter.

In the program itself there is a tab called Action Center and that is nothing but a selection of all their other products they'd like you to install and buy... But no actual Actions relevent to the current programs operation at all.

JMenning, -- My mistake! The license code in the ReadMe file must be entered before the program becomes the Pro version. Upon restarting, the program declares itself to be 5.7.1 Pro.

Rick Martin, I just tested it on my win10 SSD based laptop and it does NOT TRIM a SSD drive it "Trim"s it and all it does is Enable the OS support for Delete notify which is how Win7 and above TRIM a drive when a file is deleted.. it disables boot time defrag to extend SSD life and disables scheduled disk defragment task to extend SSD life.

Now windows 7 and above that has been installed on a SSD should have disabled the drive letters in the scheduled defragment and boot time defragment and have delete notify enabled by default.

So practically this does worse than nothing as the magnetic media drives still benefit from scheduled defragmentation.

Even worse it was unable to recognise a SSD in a USB enclosure so it treated it like a magnetic media drive and offered to defragment it! Same goes for USB flash drive it should not offer to defragment flash media on any interface since there is zero speed access benefit to defragmenting a file system on a flash memory based media and thumb drives are more vulnerable since they do not perform wear leveling like modern SSD drives do.

Glendon Gray, that trick doesn't seem to work anymore. If you want to bypass the obnoxious forced social media sharing, you'll have to use the email option provided at the bottom of the popup.

(You can use a throwaway email address to avoid giving them your real email.)

Jim Stone, simple workaround. Share it to yourself then delete it.

Bart, that only works if you have a facebook account. Many don't have one and don't ever want one.

Sonia M, would I be right in deducing that you have system restore protection enabled on the drive that lost free space during a defrag session?
If so that works by keeping databases of the drives sectors previous contents everytime you write to the drive so it can produce a historical record of the drive that it can restore the previous state using system restore and individual files if previous versions is supported and earlier versions of the file exist that could be restored. Defragmenting usually involves alot of writes to the target drive so in doing so the databases hidden away in the System Volume Information will grow proprtionally. It is not a fault or operation of the defrag program. It is one of the reasons Microsoft defragger by default does not attempt to defrag large files with fragments bigger that I think 64Mbytes as the read time is more significant as a seek and moving large chunks of data just grows the VSS protection databases eating freespace with practically zero benefit.

TK, I've followed your suggestions and I'm happy to report that the space has gone up to 156 GB. I have disabled the system restore protection, deleted the previous restorations points, and enabled it again adjusting it to the minimum usage. And finally I've created a single restoration point, just in case.
I apologize because my lack of knowledge on this matter has made me write a bad review.

Sonia M, that is basically what I would have done :-), of course I would have confirmed I was happy with how the system was performing, stability etc and that I had retrieved previous versions of any file version I might have needed again, but yes practically you'd be advised to disable system restore protection prior to defragmenting a drive using a different defragmentation tool than you normally use for the reasons discussed and then re-instating system protection and creating an initial restore point right afterwards.
Don't feel bad microsoft counts on most of its customers not understanding the intracacies of what its operating system is doing in the background without your knowledge.

Paul269, good question!

I've just investigated this and the answer is yes it does work on external HDDs. You can either
a) right click the drive in File Explorer and select "Defrag by Smart Defrag" to work on just the one drive or
b) you can run the full program which then shows *all* your drives including the external drive.

I've also discovered that you can defrag a USB stick too! It probably deals with anything that shows up as a drive in Windows File Explorer, I would imagine. The drives appear/disappear dynamically in Smart Defrag's display as you attach/Eject them. I think this is good and helpful behaviour.

ChrisM, you DO NOT WANT SSD DRIVES LISTED OR DEFRAGED!!!
SSD drives do not benefit one iota by defragging, in fact you will decrease the available writes/erase cycles left considerably by defragmenting. With electro-mechanical drives such as magnetic or even optical drives file fragmentation can impose significant extra seeking and re-syncronisation in order to find and read the next cluster in a fragmented file but SSDs incur no greater delay reading the very next logical cluster on the drive than reading the logical cluster at the far end of the drive and then back to start of the drive so zero performance gain is achieved. But since to defragment a drive takes more read/write cycles than originally went into placing the data on the SSD to start with it causes masses of unnecesary write/erase cycles. I'd go back to the version that correctly did not display the SSDs as you should not be tempted to defragment them like you do normal hard drives.

TK, please do not distress yourself. The program is not defragging my SSDs. As it happens I have switched off the automatic trim option as it has never made much difference to anything.

RCory, this appears to be the Pro version.

As far as I can tell from their website the non-Pro version is free anyway.
I guess a paid-for/licensed version = Pro.

The Pro version has a few extra functions. The differences between Free & Pro are listed at the bottom of the page here: http://purchase.iobit.com/aff/en/sd/aprnewlaunch/index.php?ref=cbssdtx&AFF=9996&__c=1

Nick, you are right, of course. This program, however, doesn't defrag SSD drives, it "trims" them. Trimming is the correct and safe way to do it.

It also handles SSHDs correctly by trimming the SS part and defragging the HD part. So I believe this program is safe for all three types of hard drive - SSD / SSHD / HDD. I have all of these and have had no problems with this software over the past 11 months of Pro ownership.

ChrisM, but the from windows 7 and above windows TRIMS SSDs that support the command anyway! And again unecessary TRIMing of a drive can induce unnecesary erase cycles in an SSD.
The only operating systems that require external TRIMing are the ones that are not SSD aware like Vista, Server 2003, Server 2008 and XP and I am very dubious about this company understanding how to TRIM an SSD under those operating systems properly without first allocating all the freespace first in order to create a free space map to then issue the TRIM commands which isa bad idea as it creates extra writes to the SSD which reduces the drives life. It also needs to handle the SCSI dellocate command to TRIM SSDs that are connected via USB devices that emulate a SCSI interface and translate SCSI deallocate command into SATA TRIM commands.

I note that on the product comparision there is no mention of TRIM support in either the Free or paid for editions, so they can't be that interested in pushing the concept.

TK, one can easily turn off the program's SSD operations and just defrag regular HDDs if there are concerns about it being potentially harmful. Just untick/uncheck the relevant drives/s in the software interface.

You may be right with your concerns and right to raise them here for all to consider. I'm not a technician, I guess each user should perhaps decide for themselves what level of TRIMming they feel is appropriate for their situation. I was just trying to reassure the original poster that this software was able to work with an SSD by TRIMming it and could handle several disk types including newer hybrids.

I agree that six months is not great. ;-)

jj juice, I actually find this defrags better than the basic windows version. Win 10 also has a built in firewall and anti-virus, so I assume you don't need to use any third party software for those.

grange, I was an avid user of Auslogics Defrag Pro (paid version) for many years. It's just not needed in Win10 OS.
Despite the somewhat positive reviews of Windows Defender - the built in AV on Win10, I still prefer 3rd Party AV and also VPN

glnz, ANYTHING is better than the native Windoze tools.

glnz, I'm no expert but for what it's worth here is my opinion:

a) better because you have five options for how to defrag the drive (large files / free space / fast / defrag&optimise / defrag&prioritize). The Windows tool gives no options.

b) I have two SSDs and they seem fine. This program does not defrag them, it "trims" them. This is the correct and safe way to do it, I believe.

c) I think the answer is yes to this too. I have recently added a Seagate Firecuda SSHD drive to my system. I have watched this software at work - first it trims then it defrags so clearly it recognises both parts of the drive. As far as I can tell the drive is working just fine.

When I upgraded using this download it kept my old registration info. If you have more than 180 days left then don't put the new registration in.

Jerry, Thanks for that tip...I got it and your right it kept my old registration so I did n't lose any months regards from Thailand.