Could've just asked me p8baller07
A full height drive is 1.5 inches high. A half height drive is between 0.75 and 1 inch high.
The difference is that a full height drive uses more smaller platters to get the same capacity as a half-height drive. The size of the drive has nothing to do with it's interface. There are some older 1.5 inch IDE drives around, but mostly they are 1 inch. Some people say full height drives are more durable than the smaller ones. SCSI drives are DEFINATELY more durable and longer lasting than IDE drives as they are usually in higher end server environments and most carry a five year warranty!
Like I said before, RAID is not a type of drive. It is a configuration of DRIVES. They can be IDE or SCSI, full or half height it doesn't matter. RAID stands for Redundant Array of Independent Disks. An array is two or more disks operating as one drive.
A normal IDE drive is half-height
By the way, I'm 100% sure that a single SCSI disc @ 10,000RPMs will run an OS faster than 2 IDE drives in a RAID 0 configuration. The RAID config will move larger files faster, though. The reason being is that say, Win XP is alwasy looking for small files throughout the HD. If the file it's looking for is smaller than your RAID stripe size then it only writes to one disc anyways so in fact it will slow your seek times down. The SCSI seek times of around 4 - 5 ms will make windows super smooth.
I think that Bigred uses SCIS discs too, you may want to ask him if his system runs faster on SCSI than IDE RAID 0.
Here are some definitions for you:
IDE - Integrated Drive Electronics - a type of interface for Hard drives, CD-ROMS ect. IDE is the standard for drives at this time. IDE has a maximum transfer speed of 133MB/sec, (150 using SATA) but usually runs around 30 - 50 MB/sec. seek times are between 8 and 13 ms. There are two types of IDE interfaces, PATA and SATA.
SCSI - Small Computer System Interface - Another type of interface for drives that uses Native Command Queing to speed the drives up and help them run at there top transfer speed all the time. IE: 40MB/sec (U160) or 80MB/sec (U320) all the time. SCSI discs also have much faster seek times, ( around 5ms)
RAID - Redundant Array of Independent Discs - A configuration of drives that allows information to be split up and wrote to two or more drives in "stripes" - both drives can read or write their stripe at the same time so it in fact doubles the speed of the drives. Also RAID can write the same information to each drive at the same time for redundancy.
PATA - Parallel advanced technology attachment Each cable has two or three connectors, one of which is attached to a controller that interfaces with the rest of the computer system. The remaining one or two connectors are attached to drives. Parallel ATA cables transfer data 16 or 32 bits at a time.
SATA - Serial Advanced Technology Attachment - This interface uses 7-pin cables for the data connection, and the data is transmitted serially rather than in parallel. In addition, Serial ATA should give users the ability to hot swap hard drives. This adds a capability that more expensive systems such as SCSI and FC have had for a long time, though it remains to be seen how widely that aspect of the technology will be used. Serial ATA also reduces the signaling voltage from the 5 volts used in P-ATA down to 0.5 volts, which reduces power consumption and electrical interference. Due to serial transfer and lower power the maximum allowable length of SATA cables is greater than that of ATA ribbon cables, which eliminates some of the problems mentioned previously
I hope this reply answers ALL your questions because my fingers are really tired and I have to do more typing to try and find a backup ATA drive