I have NAS200 working fine. Of late I found that its performance going down

I have NAS200 working fine. Of late I found that its performance going down. May lot of stuff delated and coppied on these network drives. Looking for some tool to carry out disk defragmentation and scan disc on network drives. How can I do that without taking out HDD from NAS200

Defragmentation of a network drive is impossible. Over the network, your computer only has access on a file-by-file basis, not on a sector-by-sector basis.
If it would be possible to access the disk over the network on a sector-by-sector basis, it wouldn't help anyway because your computer would have to understand the XFS or ext2 filesystem to be able to defragment it, and Windows doesn't understand either.
Furthermore, because of the way XFS and ext2 work, fragmentation is much less of an issue than with e.g. FAT32.
If your NAS200 is getting slower over time, it may be possible that your hard disk is slowly but surely dying, and that what you're seeing is that it's correcting low-level errors by retrying reads and writes. It's probably a good idea to check that you have a reliable backup. You do have one, don't you?
===Jac
Frequent NAS200 Answers:
1. DISABLE the "convert failed logins to guest logins" option to fix permission problems.
2. NEVER insert or remove hard disks while the power is on. NAS200 doesn't support hot swapping.
3. ALWAYS use the power button to turn the NAS200 off, don't just unplug it.
4. Don't trust RAID. Make BACKUPS!
5. To ACCESS the disks directly, you will need ext2 and/or XFS file systems. I recommend using SystemRescueCD.
6. Disks will get HOT with standard fan, use "green" disks or consider replacing the fan.
7. FTP server is insecure and doesn't work behind a NAT router. Use my firmware and SCP instead.
8. MY FIRMWARE supports SSH shell prompt and SCP for secure file access, and allows running other software.

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