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Acronis rescue media incorrect disk size reading.

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So I'm trying to do a simple backup of a 1tb hdd that has about 300gb of space taken up so I can put it on a 480gb ssd as the drive has slowed down a lot and hit 50% health. It has 240 weak sectors which is why I want to get this done sooner rather than later

Oddly enough, when I went to do the backup it read read the main 931gb partition as being 7.2tb. Why is that? I've already run chkdsk and seatools but they've done their scans and said everything is fine. I'm defragmenting the drive now because that hasn't been done in over 3 months, but is there anything else I can do? I don't have a 4tb drive laying around to put the backup onto so I can restore it to the SSD. 

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Scott, welcome to these user forums.

How are you doing the Acronis backup of your problem 1TB HDD drive?  Is this using the Acronis Windows application, or are you using the Acronis bootable Rescue Media?

Have you checked the Logs for the backup attempt, or is the backup size of 7.2TB being shown before you attempt the backup?

One point to be aware of is that if you are selecting (or defaulting to) 'Entire PC' then the size shown can be of all the attached drives on your computer, not just the single 1TB HDD you are wanting to backup.  If you are doing 'Entire PC' then click through this and select 'Disks & Partitions' instead, then select only the 1TB HDD drive with all its partitions.  Note: click on 'Full partition list' shown at the bottom of the selection panel to ensure that you are including any hidden partitions.

I would recommend creating and testing the Acronis bootable Rescue Media and using this to do the restore to your new 480GB SSD when you get to that point.  You should do the restore after replacing the 1TB HDD drive by the 480GB SSD and restore under the rescue media from an external drive holding the backup image.