1/ too many to mention and this forum might not like others to be mentioned tbh
2/
There are three basic types of water-cooling systems, and the real differentiator is where the radiator, water pump, and reservoir - the main components of the system - are located. The three types are internal, external and integrated.
An integrated cooling system will, as the name implies, come included as part of a PC case. Since all of the liquid cooling equipment is housed within this case, this is probably the easiest option to work with, as it will afford you the most room inside the case without having any clunky external components to deal with. The downside, of course, is that if you upgrade to this type of system, any pre-existing PC case you have is useless.
Integrated water cooling system
If you're quite fond of your PC case and don't wish to see it go, the other two options might seem more to your liking: an internal or external water-cooling system. An internal system has the water-cooling components inside the PC case. Because most PC cases aren't designed with this type of system in mind, things are a little cramped. However, this installation allows you to keep your favorite case as well as to move the finished product around with little hassle.
Internal water cooling system
The third option for those who wish to keep their existing PC case is an external liquid cooling system. In this type of system the radiator, reservoir and pump are housed externally in a separate unit. The liquid coolant is pumped into the PC case, and a return line pumps the heated coolant out of the case and into the reservoir. The benefit of the external system is that it affords the interior working space of an integrated system with the ability to adapt to use with any PC case. It also allows for a large radiator and more cooling power than the average integrated setup. The downside is that a PC with an external cooling system isn't quite as mobile as integrated or internal systems, which are much easier to move around.
External water cooling system
In our application, mobility isn't all that important, but we'd like to keep our stock PC case.
4/ raid
RAID 0 (block-level striping without parity or mirroring) has no (or zero) redundancy. It provides improved performance and additional storage but no fault tolerance. Hence simple stripe sets are normally referred to as RAID 0. Any drive failure destroys the array, and the likelihood of failure increases with more drives in the array (at a minimum, potential for catastrophic data loss is double that of isolated drives without RAID). A single drive failure destroys the entire array because when data is written to a RAID 0 volume, the data is broken into fragments called blocks. The number of blocks is dictated by the stripe size, which is a configuration parameter of the array. The blocks are written to their respective drives simultaneously on the same sector. This allows smaller sections of the entire chunk of data to be read off each drive in parallel, increasing bandwidth. RAID 0 does not implement error checking, so any read error is uncorrectable. More drives in the array means higher bandwidth, but greater risk of data loss.
In RAID 1 (mirroring without parity or striping), data is written identically to two drives, thereby producing a "mirrored set"; the read request is serviced by either of the two drives containing the requested data, whichever one involves least seek time plus rotational latency. Similarly, a write request updates the stripes of both drives. The write performance depends on the slower of the two writes (i.e., the one that involves larger seek time and rotational latency); at least two drives are required to constitute such an array. While more constituent drives may be employed, many implementations deal with a maximum of only two. The array continues to operate as long as at least one drive is functioning. With appropriate operating system support, there can be increased read performance, and only a minimal write performance reduction; implementing RAID 1 with a separate controller for each drive in order to perform simultaneous reads (and writes) is sometimes called "multiplexing" (or "duplexing" when there are only two drives).
3 / thats choice or a users opinion
