Showing posts with label USB 3. Show all posts
Showing posts with label USB 3. Show all posts

Monday, May 6, 2013

Short Review: Kanex DualRole portable Gigabit plus 3 port USB 3.0 hub

Here is an interesting little gadget for the road-warrior.

Kanex DualRole Gigabit Ethernet + 3-port USB 3.0 hub. Designed with Macbook users in mind, it is a small portable USB 3.0 hub with a VIA USB 3.0 controller and a fairly popular ASIX AX88179 USB 3.0 to Gigabit chipset. These are currently shipping for 50ドル on Amazon.






I've dealt with this type of hardware before in other hubs and USB 3.0 gigabit adapters. So the performance is pretty much standard fare if you ever used a VIA USB 3.0/ASIX gigabit adapter. What makes this device unique is the packaging and portability.



I previously toted a Thunderbolt Gigabit or another ASIX USB gigabit adapter along with several SSD drives in my backpack. I've been trying to slim my carry-on weight down so I've been investing in 64GB USB sticks to substitute for 2.5" SSD shuttle drives. Other four port USB 3.0 hubs I have tend to be bulky so this pretty much solves my problem. I figure this is something to have in the bag in the event I need it.

The hub has 3 ports instead on the usual four but I would often end up using the fourth port for Gigabit anyways. Since I already have four other ASIX gigabit dongles, this one was a plug-n-plug for me. If this is your first USB 3.0 Gigabit adapter, you will need to install thew pre-requisite ASIX 88179 drivers.

Overall, I really like it. I wish it had an aluminum finish instead of the mid-2000s iMac/White iBook white finish. The ports are fairly evenly space and you will be able to add some thick USB devices. Still, I wish the ports were a little further spread apart like some of the cheap 4 port Anker USB 3.0 hubs. For example, in the picture below, I could not add two Patriot XT sticks side by side. With different arrangements, I can still all use three ports.




There is no extra USB cable to plug in which is nice. The short cable folds in when not in use. I've read some complaints about the length of the short cable. If you are using this mobile as pictured above, it shouldn't be a problem. However, if you use this in a docked desk environments, I can see where people can complain. Below is a picture of how it dangles when connected to a Macbook on a desk stand like the mStand.




Next, it does not come with an aux power adapter. It does have a hole for an AC power adapter if you plan to power something that requires a little more juice like some 2.5" 7200 rpm drives. This is fine with me since I would only be using this as a mobile gadget.

Conclusion:

I think this is a fair price item. Most USB 3.0 four port hubs cost as little as 30ドル and a USB 3.0 gigabit adapter will run you 20ドル-30ドル on how aggressively you discount shop. The lack of a fourth port is made up with the Gigabit adapter. It uses the standard VIA and ASIX controller IC which works well with other products. I personally love the small footprint and short cable for portability reasons. However, I can see where people would prefer a longer cable in a docked desk environment.

The current competitors are SIIG and Startech. They cost a bit more (60ドル-90ドル) and are not as portable as the Kanex. They also use bulky longer USB cable which makes them more suited for a permanent docked desk environment. The SIIG and Startech USB3.0 combo Gigabit hub below. Another alternative are the DisplayLink PC USB 3.0 docking stations. They run 150ドル and up and provide USB 3.0 video which I don't need.







Wednesday, January 2, 2013

SansDigital TOWERRAID TR4UTBPN review

The SansDigital TowerRaid TR4UTBPN is a 4 bay RAID enclosure with eSATA and USB 3.0 interfaces. It was recently on sale so I picked one up.



I've had this sitting around for a few weeks and I've finally freed up some time to play with it.



SanDigital makes over a dozen different enclosures and it can easily get confusing which one to get.
You may have seen some on sale combined with eSATA cards. Take note, many are simply JBOD (Just a bunch of disk) enclosure box that require an eSATA port with port multipliers to function. Otherwise, you only see the first disk. Hence, the reason many come with eSATA card bundles. Port multiplication is not common on many eSATA interfaces; including most laptops and motherboards. Those cards often require some sort of software to run them in RAID.
So it is very critical you are aware of the difference when you shop for these type of enclosures.

Luckily, this is not a JBOD enclosure. This has a built in RAID controller and when it was priced the same as a JBOD box, I decided to pick one up. This device supports RAID 0,1,3,5,10 and as well as JBOD. These go for 179ドル-199. I was fortunate to pick this up for 99ドル.

Physical characteristics:


The box is rather tiny and minimal to accommodate 4 drives. They drives do not use a tray but do require you to fasten them down with screws.



The back takes a standard prong power plug (power supply is internal). There are two interfaces - eSATA and full size USB 3.0. There is also a dial and reset button to set the RAID modes. The front side has some little ventilation but I would prefer that the front door provided better airflow.



Setting the RAID mode is a straightforward affair. You simply turn the dial to the mode you want. You can also overcome the dial settings through the RAID manager application.


Front indicator shows activity and which drives are failing. In this case, the 3rd drive has gone bad.


The Raid Manager app shows you status and has other options to create and delete new RAID sets.




The application also provides diagnostic and notifications controls. I've read that the email settings may have some problems with SMTP servers using START/TLS authentication. I did not test to find out. Unfortunately, I could only get the Windows version to run. The Mac app didn't appear to work for me. This may be a Mountain Lion compatibility issue.





USB 3.0


Forget about it. USB 3.0 simply didn't work for me. I've read this complaint on various customer reviews and it appears the JMicron controller has some incompatibility issues with other controllers. I've tried on 4 different machines under OSX, Linux and Windows 7. All had problems with disconnects or simply not mounting. Under OSX, it would disconnect under heavy load or large file transfers. Under windows and Linux, it would randomly disconnect and reconnect every few seconds. Windows 7 would prompt me to format the unit every 5 seconds.



There may be a firmware update and I'll look into it and update this post later. For now, I would not recommend this as a USB 3.0 RAID enclosure. I've been reading other brands and make have similar problems.Customer reviews on Newegg and Amazon corroborates similar experiences. However, under USB 2.0, I didn't notice any problems.

Speed

Unlike most of the customer reviews I've been reading, I've been getting the 200 MB/sec sequential read transfers in various testing when using eSATA. The drives I used were 500GB 7200 rpm Seagates.

Windows appears to perform better (using benchmarks as well as real copies).


I only tested RAID 0 and RAID 5 but I did not see much of a performance loss going to RAID 5. The 4k/512k was about 1/4 slower in writes but the sequential read/writes were similar to RAID 0. In short, copying large files saw little loss while your random files will be faster under RAID 0 as it should be.

Here is a RAID 5:


and RAID 0



RAID 0 under Linux


Conclusion.

This box is cheap enough to get if you are using it with eSATA. I would not recommend for USB 3.0 use.

If you are a laptop user without eSATA, I recommend using a USB 3.0 eSATA adapter like this NewerTech one I reviewed earlier.






Link: http://www.sansdigital.com/towerraid-plus/tr4utbpn.html



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