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Hello @itsonlyme and :welcome:

If your Windows 10 installation is confined entirely to the C partition (default), a manual/scheduled Threat Scan is more than sufficient for a Malwarebytes 3 (MB3) Premium equipped system.  If only data/applications are stored on the second (and beyond) drive, that drive could be scanned with a Custom scan, but it is never required on a frequent basis, if ever.  As data and/or applications are read/written to/from other non-system partitions, MB3 Premium will monitor those transfers.


Reference: Malwarebytes for Windows User Guide

Edited by 1PW
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Thanks for the reply!

Whilst Windows installation is indeed confined to the C drive, I download files to my D drive. 

I had checked out the custom scan prior to posting, but cannot for the life of me find anywhere where you can choose a drive.  Nor can I see it in the link you gave for a custom scan (which I had already read)

Could you please advise me where and how I can select the drive


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Hello @itsonlyme:

As a test:

1) Open MB3's GUI > select Scan from the left column > select Custom Scan near the middle of the pane > select the Configure Scan Button at the bottom of the Window.

2) In the new Custom Scan window, the pane on the right has the ordered list of drives "seen" by Windows 10 with MB3.  You may need to use the window's elevator bar to move to the bottom of the list where that system's D drive may be shown.  Or, you may stretch the window vertically to help view a long list.  Attached is a sample view.


Please let the forum know, in a reply, if this helped.  Thank you.

Edited by 1PW
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Hi itsonlyme,

After opening Malwarebytes > clicking Scan > selecting Custom Scan > clicking Configure Scan, the drive letter should appear in the box on the left as depicted below.

If the C drive is expanded, use the scroll bar down the right side of the box to scroll to the bottom.

If you're still unable to locate the D drive, please carry out the steps below to provide us with troubleshooting logs. 

YbWgqUx.png Malwarebytes Support Tool (MBST)

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Edited by LiquidTension
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Hello @itsonlyme:

Yes.  You can schedule Custom Scans.  

All scans, including a Custom Scan, may be scheduled but only the Threat Scan is recommended.  (Once per week?)

The frequency of scheduled scans is left to your best judgement.  Remember, your system's MB3 Premium real-time protections are always guarding your system.  As I said above, data/applications are scanned in real-time as they are read/written.

Perhaps if a system has not had adequate protection for a long time, an initial Custom Scan may be warranted just after MB3 is installed.  Then, subsequent ROI is always determined by the user.  Please keep in mind the wear and tear experienced by all mechanical hard disk drives (HDDs).


Reference: Scheduling Scans

Edited by 1PW
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OK, thanks. 

However, I still can't see where you can select a drive for a scheduled scan - not in the link you sent either. 

But I must admit that I never thought about wear and tear on a hard drive from a scan!  In that case I shall probably just set an infreqent reminder to do it manually.

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Hello @itsonlyme:

Morpheus beckons.  

If you don't figure it out on your own, and if someone else does not post a procedure before I do, I'll post a Custom Scan schedule entry procedure later.

It's only a bit different from the sole recommended scheduled Threat Scan procedure.

Thank you.

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OK, I went through it again and this time it shows the drives in the customised section!!   I did have another problem previously, which I fixed this morning (answer in somebody else's post), but cleaning and reinstalling, so I am guessing that that section was broken too.  All is working now!

Thank you so much once again

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