Thunderbolt is the absolute fastest consumer interface available for users who want high-speed external storage. We proved this in our Pegasus R6 review where we sustained transfer rates of 1GB/s (8Gbps) from an array of five SF-2281 SSDs. There are just two problems with Thunderbolt today: 1) It's practically only available on Macs, and 2) the Promise Pegasus is extremely expensive.

In its cheapest configuration, the 4TB Pegasus R4 with four 1TB 3.5" HDDs will set you back a cool grand. Want the 6-bay version? That'll be $1500. And the top of the line 12TB model is priced at $2000. Less than $500 of that $2K bill is the retail cost of the hard drives, the rest is all chassis, controller hardware and of course manufacturer profit. As great as the Pegasus is for professionals who need the storage and performance, it's priced too high for most consumers who also want fast external storage.

LaCie hopes to offer an alternative for those who want more affordable Thunderbolt storage. Note that I said more affordable, and not just affordable.

Last month LaCie released its Little Big Disk, a two bay (2.5"), all metal Thunderbolt enclosure. Like Promise, the Little Big Disk is available only with drives pre-installed. Sadly our hopes of meeting a BYOD Thunderbolt enclosure remain unfulfilled. LaCie's pricepoints are a bit more attractive than Promise's, although you are getting a far lower performance solution in return:

Thunderbolt Storage Lineup
  # of Bays Drive Configuration Default Capacity Price
LaCie Little Big Disk 1TB 2 2 x 500GB sw RAID-0 1TB $399
LaCie Little Big Disk 2TB 2 2 x 1TB sw RAID-0 2TB $499
Promise Pegasus R4 4TB 4 4 x 1TB RAID-5 2.7TB $999
Promise Pegasus R4 8TB 4 4 x 2TB RAID-5 5.7TB $1499
Promise Pegasus R6 6TB 6 6 x 1TB RAID-5 4.7TB $1499
Promise Pegasus R6 12TB 6 6 x 2TB RAID-5 9.7TB $1999

The drives are available on Apple's online store as well as Apple's retail locations. The 240GB SSD model is still several weeks away from availability, so what we're looking at today is the 2TB HDD solution. I only had a limited time with the Little Big Disk and wasn't allowed to take it apart, so forgive me in advance for the brevity of this review (although I did try to hit pretty much all of the highlights of the device).

The Chassis

LaCie Little Big Disk Dimensions
  D W H Weight
LaCie Little Big Disk (2TB) 140 mm 40 mm 85 mm 650 g
Promise Pegasus R6 (12TB) 242.9 mm 188.9 mm 254 mm 9.25 kg

As its name implies, the Little Big Disk is pretty small. The blue orb at the front functions as a power/activity LED as well as an on/off button. The design is beautiful and the construction very solid. LaCie likes to think the Little Big Disk is small enough to be portable, but its weight may discourage you from taking it wherever you go. Even if you don't travel with it, the Little Big Disk's size makes it a considerate resident on a desk.

There's not much assembly required, the unit is ready to go as is. If you want a bit more stability however, LaCie supplies a small stand in the box that slides onto the bottom of the unit to prevent it from toppling over. The Little Big Disk does not come with a Thunderbolt cable, so be sure to tack on another $50 to your budget. Power is supplied via an external AC adapter that ships with swappable plugs for use in the US, UK, Australia and the EU.

Inside the chassis are two 2.5" SATA hard drives connected to a basic, non-RAID SATA controller. The SATA interface is then routed over PCIe to an Intel Thunderbolt controller and finally sent out via a Thunderbolt cable to your Mac. LaCie was pretty strict on not having us take apart its review sample so the best I have are the shots of the internals we saw surface a while ago. A closer look seems to indicate a Marvell SATA controller (not a surprise) but it's impossible to tell whether or not it's a 6Gbps solution.

Given the absence of a RAID controller, LaCie relies on OS X's software RAID. By default a single Little Big Disk is configured as a two drive RAID-0 array. For the 2TB model that means you've got 2 x 1TB drives inside, and for the 1TB model that's 2 x 500GB drives.

My LBD sample had two Samsung HN-M101MBB 1TB drives inside. These are 5400 RPM 3Gbps SATA drives with an 8MB buffer, 5W max power draw and 2.2W typical. Interestingly enough, the first user who posted pics of a dissected LBD found a pair of 7200RPM Hitachi 7K750 (500GB) drives in his. I don't have enough of a sample set to know whether or not all 1TB models use 7200RPM drives and all 2TB models use 5400RPM drives, but it looks like you can expect to see some variance between models.


With only a pair of 5400RPM 2.5" hard drives, the Little Big Disk isn't going to break any performance records. In fact, had LaCie outfitted the chassis with a single SSD we would've seen higher performance than the two-HDD setup it comes with from the factory. That being said, if you're a Thunderbolt Mac owner, the LBD is the second fastest external solution you can buy today (without resorting to an ExpressCard to eSATA bridge or something similar):

LaCie Little Big Disk Performance
  Sequential Read Sequential Write 4KB Random Read (QD16) 4KB Random Write (QD16)
LaCie Little Big Disk 2TB (RAID-0) 207.0 MB/s 205.0 MB/s 1.22 MB/s 0.56 MB/s
Promise Pegasus R6 12TB (RAID-5) 673.7 MB/s 683.9 MB/s 1.24 MB/s 0.98 MB/s

Sequential performance is obviously the LBD's strength, at over 200MB/s in both of our Iometer tests. This is the sort of performance you'd see moving large files (e.g. videos) to/from the device. We are completely limited by drive performance here, Thunderbolt is capable of at least 8Gbps as we've seen from our tests and the Little Big Disk is only pushing 1.66Gbps. Random performance is of course what you get from mechanical storage. An internal SSD will do better for your OS and apps, but for use as backup or media storage (photos, videos, archives, etc...) you'll see performance closer to 200MB/s.

Thunderbolt Display Compatibility

One of the first things I tested was to see if the audio corruption issue I experienced with the Pegasus and Apple's Thunderbolt Display was present on the Little Big Disk. To recap, if you were playing music on the TB Display (via its internal speakers or USB audio connected directly to the monitor) while writing tons of data to the Pegasus you'd eventually get audio corruption. I tried the same test with a Mac connected via Thunderbolt in place of the Pegasus and didn't see an issue. I repeated the test with LaCie's Little Big Disk in place of the Pegasus and once more, didn't see an issue. The only time I got audio corruption was when I plugged in the LBD while the Thunderbolt Display was already playing music. Resetting the audio codec at that point fixed everything and I didn't see the problem resurface. As I alluded to in our Thunderbolt Display review, Promise developed and released the Pegasus before the TB Display was available. LaCie had the luxury of continuing testing and validation after the TB Display was launched, which likely gave it a bit of a leg up in this department.

Interestingly enough, I couldn't get the LaCie LBD to daisy chain with my Pegasus, although I'm not sure which device was at fault there. If I connected the Little Big Disk after the Pegasus, the LaCie drive wouldn't work. If I connected the LBD before the Pegasus, the Promise array wouldn't work. The Little Big Disk did work properly connected directly to my MacBook Pro and Thunderbolt Display. Update: Moving the Thunderbolt Display to the end of my Thunderbolt chain (rather than the middle) fixed this issue. After I did that, both the LBD and Pegasus appeared. I was then able to move the Thunderbolt Display back to its original position in the chain and both drives continued to work as expected.

Power Consumption

Thunderbolt is capable of delivering 10W to a connected device, however the drives alone in the Little Big Disk can consume as much as 10W (2 x 5W) during startup. Add in the SATA and Thunderbolt controllers and you can quickly understand why the Little Big Disk needs an external power supply.

Power Consumption Comparison
  Idle Load (Sequential Write)
LaCie Little Big Disk 2TB (RAID-0) 7.8W 12.1W
Promise Pegasus R6 12TB (RAID-5) 64.3W 69.1W

Power consumption isn't in-line with expectations. At idle the Little Big Disk pulls just under 8W, while under load (sequential writes) it's a hair over 12W.

Noise & Thermals

The Little Big Disk is cooled via a single internal fan. The size of the chassis limits the fan size, which puts LaCie in an interesting predicament. LaCie could either allow internal temperatures to get uncomfortable warm and keep the chassis quiet, or keep temperatures in check and sacrifice noise. It picked the latter.

Under normal operation the 5400RPM drives in my LBD sample remained at around 44C. The highest I ever saw the drives hit was in the low 50s. Internal drive temperature doesn't seem to be a problem with the Little Big Disk, which is good news.

Unfortunately the chassis is loud as a result. It's louder than both the Promise Pegasus and a 15-inch MacBook Pro (at normal temperatures, under load with fans at full speed the MBP is louder). Thankfully there's no whine, it's just the sound of a lot of air being moved via a relatively small fan. It almost sounds like you've turned on a small desktop somewhere in the room. The noise is my biggest complaint about the Little Big Disk. My only hope is the SSD configuration will be able to back off on the cooling requirements and deliver a quieter solution.

Final Words

Thunderbolt products are finally starting to roll out. The Pegasus was a good start, and the Little Big Disk gives customers a more palatable price point. To hit the lower price LaCie does sacrifice a bit on capacity and performance. The move to 2.5" hard drives and only being able to accommodate two of them in its small chassis limits peak performance to around 200MB/s. Compared to USB 2.0 and FireWire 800 options however, that's not bad at all. Even compared to GigE, you're still looking at a significant performance improvement. If you do a lot of large file transfers onto your external storage, the Little Big Disk will likely be a huge step up from your current solution.

My biggest complaint about the Little Big Disk is its noise. While I'd rather accept a louder solution than one that kept drive temperatures uncomfortably high, I'd much rather not have to choose between either. LaCie may have painted itself into a corner here by aiming for such a small device size. If you're a stickler for quiet computing the LBD may bother you. If you're fine with some extra fan noise then you'll be just fine.

I do like the Little Big Disk chassis a lot, I only wish LaCie would offer it sans-drives to hit an even more affordable price point. The empty chassis game is a race to the bottom however and I don't see LaCie wanting to play in that space. We'll have to wait for other manufacturers to jump on the Thunderbolt bandwagon before we see a BYOD solution.

If I can't have an empty chassis, here's hoping that LaCie's forthcoming SSD version will be everything I hope for in an external Thunderbolt solution. With lower cooling requirements it could address the noise issues and performance should obviously go up. The only question is, will LaCie be able to deliver a solid-state Little Big Disk at a reasonable price? We'll find out soon enough...

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  • mediajediX - Monday, October 31, 2011 - link

    Based on the information I have from Lacie all 1TB units are 7200 rpm drives while all 2TB units are 5400 rpm drives. There should be a little bit of an increase in performance on the 1TB units compared to the 2TB ones.
  • Grizzlebee - Monday, October 31, 2011 - link

    You might have a copy/paste error on the first table under drive configurations for the 2TB LaCie.
  • fic2 - Monday, October 31, 2011 - link

    Agree. Pretty sure that the second row is incorrect. Says:
    LaCie Little Big Disk 2TB 2 2 x 500GB sw RAID-0 2TB $499

    but should probably be 1 x 1TB sw RAID-0
  • gevorg - Monday, October 31, 2011 - link

    LaCie prices are like its 2009!
  • xeizo - Monday, October 31, 2011 - link

    The word "affordable" may be even more obsolete in this case, considering the prices for hdd:s are rising sky high after the flood in Thailand ...
  • descendency - Monday, October 31, 2011 - link

    I'm sorry, Dave. I'm afraid I can't do that.
  • Meaker10 - Monday, October 31, 2011 - link

    I can tell you why the 1TB drives are all 5400rpm, because normal height 7200rpm 1TB drives dont exist yet.
  • repoman27 - Monday, October 31, 2011 - link

    Precisely. It would be cool if they offered a 1.5TB model based on 7K 750GB drives though, seeing as how it would be a tad quicker than the 1 and 2 TB offerings.
  • GotThumbs - Monday, October 31, 2011 - link

    Interesting review and I'm glad to see the use of smaller drives in a central storage system. an NAS with 2.5 drives would be a welcome product IMO.

    BUT...........When can we expect the lawsuit against Apple? Microsoft was sued for having a web-browser integrated into their OS, but Microsoft NEVER Locked Down the OS to prevent anyone from installing/using another web-browser.

    Why is this product ONLY available through Apple stores? NewEgg sells apple accessories, why are alternative retailers locked out of the distribution?

    Apple has built/established an ecosystem/empire so restrictive, I can't even draw a comparison. I gladly welcome the date when Apple is FINALLY called out for the controlling/repressive methods it continues in its daily operations.
  • ananduser - Monday, October 31, 2011 - link

    Apple has exclusivity on the TB port until 2012, exclusivity granted by Intel. It is how Apple works. The whole tech world must stop and wait for them to get their money's worth from their exclusivity contracts, and then are supposed to adopt the format or they are branded against Apple.

    I am surprised that all the other PC manufacturers do not go to Intel and tell it not to treat Apple(a competitor for the same chips) with exclusivity periods on fresh server/consumer chips/chipsets that Apple gets from Intel. It is working against their products from a marketing point of view. I would like to see that the non-Apple tech world turns 180 on Intel's plans and decide to adopt Sony's TB over USB-like port implementation.

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