changing file format on 5672

The short answer is:
Use windows Convert tool (commandline) to convert from FAT32 to NTFS. You don't have to worry about cluster alignment because clusters are already aligned for conversion from FAT32 to NTFS.

Pitfalls (as usual):
1.
it doesn't work the other way
2.
The D2D recovery from the hidden partition (or CD2D from backup DVD of factory install or recovery CDs) will always set back a FAT32 partition (I think they even expect your current C-drive (not the hidden partition) to be FAT32 if I remember well.
3.
eRecovery may run AWOL if you convert D to NTFS, so you may want to uninstall this when you convert.

Generally search for eRecovery on the Acer forums and see what else it comes up with (some of itmay be a bit contradictory, even passionate contradictory).

HTH

Drio

If you have PM or a comparable tool it is even easier.
PM (recent versions) also can convert back to FAT32.

Still advisable to backup (full partition images!) first though.

One possible pitfall when removing the hidden recovery partition (I would not advise you to do so unless you have read and contemplated some recent threads on the hidden partition, pqservice and erecovery) is that it changes the partition numbering.
This affects windows booting since the boot.ini referes to the second partition and should refer to the first one after you removed and merged the first partition in the second one. (If you leave the space empty you may not have this problem because in that case windows will see the empty space as the 1st partition.)

And the Acer MBR will try to hide the first partition, so if the Acer MBR is still intact, you'll experience that your windows partition disappeared.

You can destroy the MBR if you have a Windows installation CD. boot from the CD and go into recovery mode. Logon to your Windows installation, type HELP and see the options. FIXMBR should overwrite the Acer MBR.
I think FIXBOOT allows to reconstruct a boot.ini (all command display help, e.g. after FIXBOOT /?)

If you don't have a Windows install CD, look for the DaveLessnau thread whihc explains how you can create one from the stuff already on your HD (or recovery CDs/backup DVD).

You may or may not want to keep different partitions for system and data (there have been some passionate exchanges on this recently which may assist you to make up your mind on that one)

HTH

Drio

After converting from Fat32 to NTFS, I used Partition Magic to delete the D: partition (it was empty yet), then expand C: partition to full size (if you have data on both, you can just as easily merge partitions with PM.) It took 5 minutes, and everything works great. (I left the hidden recovery partition intact, just in case.) BTW, you can find Partition Magic for ~ $18 via pricegrabber.com as OEM software, rather than paying retail.