Dear Sir, I have changed the cluster size from 512 bytes to 4096 bytes in a NTFS partition and Disk Director Suite Server 10 said that everything was fine, the operation completed successfully. But, after restarting, Windows 2003 SP1 wouldn't boot anymore (It couldn't even show the Windows logo, just "Disk read error. Press Ctrl-Alt-Del to restart). I booted with the Windows CD and selected the Recovery Console, and then I typed "chkdsk c: /P". chkdsk said it was recovering files, but it seems to be stuck at 50% and it's been running for 30 minutes already. The system is the following: HP Proliant ML350 G3 HP Ultra3 SCSI controller integrated in the mainboard (uses an Adaptec chip) 1.5 GiB of DDR-SDRAM (Registered ECC) 18 GB Ultra320 SCSI Hard Disk drive (15.000 rpm) Is it a bug in Acronis?