it blew up my bios in the mainbaord. make it unusable.
i already change the board and harddrive up to 6 times
Read up on linux filesystem. Defrag and scandisk are not necessary and might damage your drives if provided as a "button" for user to click. The console tools are still there, either use fsck or e2fsck,
warning : read on how to use it.
Virus....
1. It's a human problem, your behaviour causes it to be infected.
2. It's linux, typical windows virus don't infect linux
3. It's linux and a NAS, it don't have much applications for you to run.E.g email client. It don't have "autorun" junk like windows OS, e.g screensaver, email scripts,etc. Most of the time you are running it manually(hopefully "clean" stuff) and will be rarely running any crap on the machine. If still love to run crap, refer to point 1.
4. Yes, there's antivirus for linux. Mainly to scan files you store there infected with windows virus that don't affect linux, e.g Word documents infected with virus script. Might as well check your files on the PC first before moving them over. Refer to point 1...
5. Yes, there's very few linux viruses, it takes a complete idiot to infect himself, refer to point 1. Less than 100 linux viruses compared to almost 1 million windows viruses...
You'll have more a security threat from people/bots/worms hacking into you if you open the NAS to the internet via unsecured "features", e.g FTP, HTTP, blah. Even secured feature like SSH will be hacked over time via brute force, provided you attracted some script kiddie or a real hacker attention for some inane reason ...