I recently purchased a Seagate Momentus 2.5" 5400.3 160 gig SATA drive to upgrade from my Hitachi travelstar 5400 sata 60 gig, in my Dell XPS m1210 laptop.

I used a program that came with an external enclosure I bought (Apricron EZ upgrade kit), it looks very similar to Acronis True Image. After cloning the drives, I popped in the new Seagate, and my computer wouldn't boot up properly. I decided to then reformat the drive, and start over again using Acronis TrueImage instead.

But I then noticed that, my drive was now displayed as a 60 gig (49.7 free), exactly the same as the original Hitachi, although the description was still the Seagate model.

I then cloned it again, using AcronisTrue Image, this time it booted correctly, but it's still displaying as a 60 gig. I looked, and there's no hidden partitions or unallocated space. If someone knows how I can get the right capacity back, I'd appreciate it!

My guess is, when you cloned, you told it to do an absoluterly identical clone, including creating a 60GB partition as the destination. The remainder of the new drive is unallocated space.
If you're using Acronis True Image, re-do the cloning, but look around among the options. You should find one which will destroy all previous partitions on the DESTINATION drive, then "clone" the original drive to the new one using ALL of its available space as one volume, and making it a bootable drive. That is not an absolutely identical clone, but it is the way most upgrades to new (and larger) drives are done.

Has anyone found a solution to this problem?

I am having the exact same problem.

I cloned my 60GB Hitachi HD to a 160GB Seagate on my Dell Inspiron E1705 usin Norton Ghost. Now my 160GB shows up with the exact same size as the original Hitachi and there is no unpartitioned space to account for the remaining 100GB.

I am having this same exact problem as well. I have a dell XPS m1210 with a 100gb SATA drive. I bought a 200gb SATA drive used Acronis True Image to make a clone. Now the new 200gb is showing up as a exact clone of my 100gb dive. Some how I lost 100gb. It's not even showing up as unallocated space. I've even tried using disk director to completely wipe the dive and all teh partitions yet it still shows as a 100gb drive. Even the Bios reports it back as 100gb! Could I have somehow rendered 100gb of my 200 gb drive useless?

I ended up sending my drive back for a replacement because I could not figure out a way to have my system recognize the lost space. I used Norton Ghost to make the clone the first time, using the default settings. After receiving the replacement, I cloned my 50GB laptop drive to an old 60GB 3.5" drive, just to check if it would then see it as a 50GB drive. I used XXClone to make the copy, and it worked without any problems. I then cloned my 50GB laptop drive to the new 150GB drive, and that also worked fine. I think what happened when I cloned with Norton Ghost, was that it replaced the Volume ID and Serial # of the new drive, with that of the old drive. If you have two of the same drives, or have a friend that might have the same drive, you can probably clone their drive's Volume ID to yours. You may also be able to contact the manufacturer of the drive to see if they have a tool to replace or rewrite the volume ID. Good luck. Let me know what you end up doing.

I had the exact same problem. I used a demo of Acronis Easy Migrate 7 to clone my Hitachi 60 GB internal drive to a new 160 GB Toshiba drive in an external USB enclosure. The external drive now reports a 47.5 GB size (or therabouts).

The conclusion I have reached is that either cloning to a larger size or the fact that the target drive is in a USB enclosure leads to this problem. Either way, I am probably going to send the drive back unless I find a way to fix this.

And that was using an XPS laptop, both drives are 2.5'

Go grab a copy of seatools.
http://seagate.custhelp.com/cgi-bi [...] faqid=4672

There's an option to change the drive size (to anything smaller than it really is). There's also the ability to resize it back to the max. capacity.

I was able to fix this problem after reading this page
http://www.goodells.net/dellrestore/hpa-issues.htm
It explains in detail what happened and why the clone wont work.
I downloaded the "magic boot disk (mhdd)"
Boot from the cd, type in HPA
type in the correct size (the large number that it shows)
then type in fdisk to repartion the drive.
Your drive is now fixed,