SANS DIGITAL TR4M RAID 0, 1, 10, 5, 5+spare, spanning and JBOD 4 3.5" Drive Bays eSATA 3Gbps (via Port Multiplier) 4 Bay SATA to eSATA (Port Multiplier) JBOD Enclosure

Pros: This a great product that functions just as the description says. Installation is quick and easy. Unit is quiet and unobtrusive. Email and forum support is fast and quite good.

Cons: None so long as you know what you are getting. No direct windows 7 support for RAID drivers. (The Vista 64bit drivers do work but are very old.)

Overall Review: Be aware: *This product is not HARDWARE RAID. *The manufacturer does NOT host drivers or software on their site. The drivers are hard to find if you don't know where to look for them. (Look on sansdigital's website and click on the community button). *Non-Windows hardware compatibility is spotty, view their forums prior to purchasing. All in all this is a GREAT product as long as you understand it's limitations.

Pros: I have two of these units configured as RAID5+Hot Spare on Win2003 server. Both units on single supplied controller never miss a beat. The hot spare fail-over seamlessly moved data from a dead drive. Tech support from Sans Digital is excellent, helpful and understand their product.

Cons: Supplied eSATA cable too short for my setup. Purchased a 6-foot cable here at Newegg.

Overall Review: Drives easy to install, access and replace.

Pros: Hot swappable drives, just slide in and out, ease of set up. Included Esata PCI card worked flawless with my Mac Pro 8-core 3.0Ghz. Just dropped in the card, installed the supplied driver, put my drives in and I was off and running. Using OS X 10.5.6 Leopard and just used the Disk utility to format my drives in to 2 Mirrored arrays. Total set up was 30 minutes. Installed four 1.5TB drives for 3TB of total mirrored storage. Even looks good in Silver next to the Mac Pro!

Cons: None so far

Pros: Installed HD's, connected eSATA and power cable, turned on Sans Digital enclosure and WHS and it worked. Provided easy easy expansion with high data transfer rates. HD's run much cooler than the HD's in my Mediasmart WHS.

Cons: You can't just buy the enclosure? It comes with a pci-e eSATA card and software that I didn't use. You have to remove the outside cover to to secure the HD's. It would have been nice if there was some other to secure hard drives but that probably would have made it cost more.

Overall Review: I now have 4.4 TB of HD space it is amazing.

Pros: Nice sturdy construction Fast eSATA connection to my server Room for expansion - up to 4 SATA drives Pretty quiet Got it in a combo deal at a great price

Cons: Annoying blue light on rear fan

Overall Review: I haven't used the RAID card that came with it. I'm using a HighPoint RocketRAID 2300 (4 ports) with one port connected to an eSATA bracket. The enclosure has 2 WD Green 1.5TB drives, set up as 2 separate JBOD volumes. I'm using this in Windows Home Server to back the server. Right now, WHS only supports backing up the shares, but I'm hoping they'll add the ability to back up the OS and PC backups as well some day.

Pros: - Easy addition of storage - Easy to pop in or remove drives - Port multiplier and eSATA work great - Nice design and compact - Do not need to use RAID and can have all four drives show up independently - Nice build, except the door (see Cons) - Two thumb screws per drive - Nice eSATA cord - Port multiplier card included

Cons: - Plastic door worries me. I worry the slightest tension will snap the hinge. I knocked off an egg for this. Maybe this is getting too picky for some, but I really do not like the door compared to the rest of the build (the rest of the unit is very sturdy). - Blue LED fan? Come on, is this some 14 year old's storage solution?

Overall Review: I am not using any RAID. All four drives show up independently in Windows Vista 64-bit and Ubuntu 9.04 64-bit - and that was what I wanted because I tend to move drives around. I removed the glowing blue fan and replaced it with a Thermaltake A1357 80mm Case Fan (bought here on Newegg). This fan moves a ton of air and keeps the drives cool. The stock fan seemed to be doing fine, but I wanted max cooling. If you want a quiet device - do not use the fan I added because it can get loud when at max. I do not mind the noise where my device is located because noise is not an issue - heat is.

Pros: Cheap price, well made! Fully supported under Ubuntu Linux. Comes with cable and card. Cooling is good. Fan is silent.

Cons: Non Locking ESATA Cable, and cable is a bit stiff. Blue Lights on the fan (Why?) (Can be cut as they are exposed) Have to remove cover to remove drives. Not a big deal!

Overall Review: For those of you that say you can not remove the drives. Just loosen the thumb screws holding the drive in, and use them to slide the drive forward. I am using this with a MythTV setup and 1TB WD black drives. Wish I would have purchased 2 when they were on sale.

Pros: This product is the best software RAID I have ever used. Setup is so simple I could have had my 3 year old do it. Have had no issues what so ever with this product. OS-Windows Server 2003 Enterprise Edition

Cons: Box does not power off if attached PC shuts down. (not a big deal since it is attached to my home server which is always on.)

Overall Review: This is a solid item for the usual price AND I got it when it was on SALE!