Possibly a bit late, but I have something to add which may be of interest. I have had a 1 Tb Seagate SSHD on my desktop for about six months now. The drive contains a single partition with Windows 7 and all my software and work folders. Every day I run CCleaner to clean up the drive - mainly Internet cache stuff. About once a month I use the Windows disk cleanup utility to remove mainly residual Windows Update stuff. Apart from this, I do no disk maintenance at all - leaving it all to the caching of the SSHD to sort out. Regular monitoring of defragmentation shows that this regime keeps defragmentation at about a very acceptable 2% - it has never been higher than 3%. So, with an SSHD, defragmentation is not necessary - the operation of the SSHD, combined with regular clearing of temporary rubbish, automatically does a form of defragmentation for you. Using a defragger with an SSHD is also very undersirable, since it temporarily wrecks the improved performance from using an SSHD and shortens the life of the solid state part of the drive.