Product Review: Drobo 5D

Posted on by Larry

NOTE: I am a firm believer in ethical product reviews. For an explanation of how I review products, click here. Drobo has been a past sponsor of my Digital Production Buzz podcasts. I also currently own a Drobo.

I have eagerly looked forward to the Thunderbolt-based Drobo 5D since it was first announced last July. This week, the good folks at Drobo offered to send me a 5D for a few days to review, and I’ve spent the last two days working with it.

For my testing, I used a one-year old MacBook Pro with 8 GB of RAM and OS 10.8.2. I used both the AJA System Test utility and Activity Monitor to measure data speeds.


The Drobo 5D is an easy-to-use, expandable RAID-5-like device that provides capacity, data protection, and performance sufficient for almost every video editing task. It is not the fastest RAID available, but for most editors, it doesn’t need to be.


I’ve used and reviewed Drobo storage for several years. My first Drobo was the original FireWire, 5-bay unit; which I’ve since given to my son.

Currently, my company uses a maxed-out DroboElite, which I purchased about a year ago. This is attached to our network switch via iSCSI and accessed via Ethernet as network-attached storage (NAS). While I am grateful for the 18 TB of online storage space, the performance of the DroboElite over the network is too slow for video editing.

NOTE: Video editing is THE most taxing task we can do on a computer. It demands fast computers, fast storage, and extremely efficient system components to handle the massive amounts of data flowing through the system in real-time. However, the heart to efficient video editing lies in the storage system.

Drobo is justifiably famous for manufacturing gear that is easy to use, expandable, and allows you to mix-and-match drives as your resources allow. It is impossible to overstate how unique this flexibility is in the market today. All other RAID vendors require you to decide total capacity when you buy the RAID, and any upgrades require getting all new hardware.

NOTE: The Drobo 5D is similar to a RAID-5. Read this for a description of what RAID levels mean, as well as other general definitions. Drobo uses a technology called “BeyondRAID,” which you can learn about here.


The Drobo 5D arrived in two boxes: one containing the Drobo itself, and the other containing the hard drives to go in it. However, I didn’t need the drives as I had five 2 TB Seagate drives just sitting around after a recent upgrade to the DroboElite, so I used my own drives for the test.

With the exception of Apple, no one understands how to make technology friendly and accessible like Drobo. From the nice cloth bag containing the unit, to the casual writing style of the Quick Start Guide, Drobo wants to do more than make this hardware a part of your computer system; Drobo wants to be your friend. After wading though far too many opaque setup guides, I like this approach. Anything that decreases my stress in setting up a new piece of gear is a good thing.

There are exactly two cables to connect: power and Thunderbolt. It is impossible to screw up these connections. However, I would really like a twist-lock power connector to keep it from accidentally disconnecting simply because the cord got bumped, which happened to me during testing. The power supply is a small black box that sits on the floor.

The front cover is attached magnetically, which I like a lot. Pull the front cover off and slide in the drives. The screen shot below shows the working end of the Drobo.

NOTE: Someone was paying attention to fan noise. The unit is not soundless, but it is quiet and two people in the office commented that the fan noise had a pleasing sound to it. The Thunderbolt cable is 6 feet long, so you can move the unit somewhat away from your work area.

NOTE: While the Drobo 5D can work with half-height drives, Drobo does not recommend using them. They work fine, but they don’t fit snugly. Also, while full-height drives are manufactured to meet a common design standard, that is not true of half-height drives. Some hard drive vendors move the positions of the data connectors. My suggestion is to stay with standard, full-height, SATA drives; which can be found everywhere.

Drobo provides a very clear, simple, QuickStart guide to get you started in the right direction. Drives slide in easily, cables attach quickly, and the SSD card goes into the bottom without any problems.

Setup is truly simple. If I was starting with a clean system, I would be up and running in about five minutes after opening the box.

However, for me, once everything was connected and powered on, the problems started. The unit was not recognized by my Mac. Red lights next to all drives. Dead. Sigh…

This pointed out three valuable lessons:

  1. Always read the Quick Start Guide (which I did, by the way).
  2. Always work with the latest software designed for your storage hardware.
  3. The quality of a company can best be judged in how they handle problems.

I contacted tech support and over the course of the next 24 hours, I learned the following:

  1. Because I was an existing Drobo owner, I was running an outdated version of the free Drobo Dashboard, which is the utility used to setup and control all Drobo devices. Because the Dashboard was out of date, it could not find the Drobo 5D, so the Drobo would not mount to my Mac’s desktop.
  2. The Drobo had outdated firmware, which was easy to download and fix using the Dashboard, once we got the right version of the Dashboard installed.
  3. The hard drives I was using were formatted for a different Drobo and needed to be reformatted to run on this Drobo. Again, easy, once we got the Dashboard running.
  4. The SSD drive shipped with the Drobo was bad. That would not affect getting the system started, but did impact overall performance. Drobo sent me a replacement via FedEx that arrived the next day.

Once we figured out the problem was outdated Dashboard software, getting everything else to work took a couple of minutes. (In fact, during my testing, I added drives, reformatted the Drobo, and reset the entire system in a matter of 20-30 seconds.)

Personally, I love blinking lights and the Drobo has four sets:


One of the new buzz words in storage is “hybrid-drive.” This is a combination of an SSD drive for speed and spinning hard disks for low-cost and large storage. As illustrated here, Drobo has added an SSD card slot to the 5D; specifically this is the 60 GB card shipped with the unit I received for testing.

SSD drives provide a SIGNIFICANT performance boost if you are working with small files over and over, or doing lots of database transactions. Files stored on the SSD are accessed FAR faster than files on the hard disk.

What Drobo has done is added intelligence to deciding which files to store on the SSD. Files you use more are automatically moved to the SSD. This is the same concept as Apple’s Fusion drive in that it speeds things up automatically. There’s no configuration and nothing to adjust.

The chip is stored in the bottom of the Drobo and can easily be installed by the end user, as you can see in the photo above. It can just as easily be updated as larger sizes become available.

If you are buying the Drobo 5D, buy the card. You’ll see why in a moment.

BIG NOTE: Because of the BeyondRAID technology used by Drobo, while adding the SSD card in the bottom slot definitely speeds performance, replacing the standard hard drives in the unit with SSD drives will not significantly improve performance. For the best balance between performance and cost, configure the Drobo with the SSD card and standard hard drives.


Using the Drobo Dashboard (Settings > General) you can set whether you want the Drobo to protect your data in case one drive fails (the equivalent of RAID-5) or two drives fail (the equivalent of RAID-6).

Plus, you can determine how long the drive will wait before it spins down. For best performance set this to Never. For best energy savings, set this to 15 minutes. And, you can determine how bright the lights are.


One of the benefits to a Drobo is that you can start with only two drives – though I strongly recommend starting with three because the speed benefit is significant – then add more drives as your needs and budget allow. This expandability is one of the hallmarks of Drobo.

Drobo has published performance specs here:

I decided to run three tests, using two configurations:

What I did for each test:

Empty hard drives are the fastest. The fuller a hard disk gets, the slower it goes. So, I wanted the Drobo to be empty to test for the maximum speed.

My expectations were that I would see about 100 MB/second of data transfer speed per installed drive. As you can see from the table below, the Drobo fell far short of my expectations.

Write Without SSDWrite With SSDRead Without SSDRead With SSD
3 Drives110 MB/sec264 MB/sec132 MB/sec158 MB/sec
4 Drives133 MB/sec183 MB/sec83 MB/sec95 MB/sec
5 Drives190 MB/sec202 MB/sec154 MB/sec180 MB/sec

Two notes: 1. Speed is highly dependent upon file size, keep reading to learn more. 2.There is “measured” performance and “real-world” performance, which I’ll talk about that in the next section.

NOTE: The SSD made the biggest difference in speeding recording to the hard disk. Unless you are working with the same media over and over, the SSD won’t make much difference in playback speed.

This screen shot shows the results of five hard drives running without the SSD card. Notice how the speeds improve as file size increases.

NOTE: I modified the layout of the test results to fit into a smaller space. The left column indicates the file size being transferred. The center column shows the Read (playback) speed for that file size. The right column shows the Write (record) speed for that file size.

This screen shot shows the results from five drives with the SSD card. The difference is striking.

I was also struck by the difference in speeds as the file size changed. In this screen shot, I’m using five drives with the SSD. Notice that while write (recording) speed remains relatively constant, the read speed dramatically improves as the file size gets larger. (This is a graph of the numbers displayed in the screen shot above.)

This tends to suggest that because video editing works with larger files, you should expect better performance. Still, I was surprised and disappointed that the measured speeds were far less than I was expecting.

NOTE: By way of comparison, a FireWire 800 drive has a speed around 85 MB/second. A two-drive G-Technology RAID-0 (which has no data redundancy) measures around 275 MB/second.

UPDATE – 12/8/12

One other thing I noticed after I wrote this review. When I connect both a Drobo and a G-Technology Thunderbolt RAID at the same time, the connecting order makes a difference. If you connect the G-Technology to the computer and the Drobo to the G-Tech, there is about a 25% drop in write speed, and a 10% drop in read speed. The G-Tech did not change speed based upon connection order.

I contacted Drobo about this and they told me: “Per Thunderbolt specifications, Drobo is passing-thru traffic without impedance in your testing, where the G-Tech adds impedance in your findings.” In other words, data is traveling through the Thunderbolt ports of the G-Tech slower than it is through the Drobo. To minimize this speed drop, connect the Drobo directly to the computer.


As I was researching this article, I spoke with Mario Blandini, VP of Marketing for Drobo about this. He said: “Overall, Drobo is not going to be faster on streaming (read or write) than other devices in the market. Our newest Drobos are dramatically faster than the prior generations, and fast enough for many to have a great experience using them in their workflow. On pure benchmarking though, Drobo will not be the fastest.”

I agree that the new Drobo is MUCH faster than earlier Drobos, so, rather than asking simply “How fast is the Drobo 5D,” I decided to ask the question a different way: “Is the Drobo 5D fast enough for video editing?”

And here, the answer is yes, with a few qualifications. Let me explain.

First, I decided to see how it would do duplicating clips. In this example, I am duplicating three 31 GB files using the Finder. The Drobo duplicates the files around 110 MB/second, which is about the speed of an internal hard drive on a MacPro. Not bad, not great.

If you are doing regular video editing by dropping clips to the Timeline, the Drobo is plenty fast. At most, you would need 20-30 MB/second of data, so the Drobo has speed to spare. This screen shot illustrates an XDCAM 720p/60 clip playing in the Timeline, with about a jillion edits in it.

In other words, the Drobo can easily handle normal editing.

The REAL challenge becomes multicam editing. In this screen shot, I built an eight-angle, XDCAM 720p/60 multicam Timeline in Final Cut Pro X, and edited the heck out of it.

The data rate is fairly low and the edits were smooth. Zero dropped frames. The Drobo performed perfectly.

This time, I decided to create a ten-camera ProRes 422 720p/60 multicam clip.

NOTE: ProRes 422 is the video format Final Cut Pro X uses when optimizing media during import.

Here, the data rates tripled, but FCP X played everything smoothly, no dropped frames and the Drobo had the speed to support this as well. So, based upon what I saw, for most normal video editing tasks and multicam editing up to about 10 angles, the Drobo 5D should be fine. If you need faster performance, you should consider other gear.

However, I was never able to get performance that ever exceeded 300 MB/second. Perhaps, when all data is stored in the SSD this is possible, but this is not a likely scenario for video editing.

NOTE: One of the reasons Drobo is slower than other RAIDS is that, in order to enable the expansion and flexibility that it is famous for, it can’t use a hardware-based RAID controller. Because the RAID is built in software, pure performance will always be slower than a hardware-based  RAID.


Earlier today, I spoke with Tom Coughlin, President of Coughlin Associates, a firm that specializes in tracking the storage industry. I asked him why Thunderbolt was so slow in rolling out. Tom told me that it was a case of the industry needing to understand a complex new data protocol.

Also, adding to manufacture’s delays is a Thunderbolt Certification process that requires both Intel and Apple to sign-off on all new storage devices.

I asked Mario Blandini about the certification process and he pointed out that both the 5D and the Drobo Mini are Thunderbolt-certified. “When you are dealing with something as critical as storage, you really need to be sure that the hardware works properly with all the other hardware that’s out there,” he said.


If you are looking for the fastest-possible RAID, the Drobo 5D is not it. However, you only need that speed if you are editing large multicam events with video stored in ProRes format.

If you need to save money, buy three drives. If you want the fastest performance, buy five drives. I was very disappointed with the performance of the unit when only four drives were installed, so avoid this configuration. I also recommend against the 2 drive configuration, which will not have performance sufficient for video editing.

Also, buy the SSD card. In all cases, even for very large files, this improves performance. The price of the system that I tested (remember, I provided my own hard drives) was $849.

If you are looking for a reasonably fast, highly-expandable, Thunderbolt RAID-5, the Drobo 5D is an excellent choice.

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113 Responses to Product Review: Drobo 5D

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  1. Great view. Answered a lot of questions I had. Thanks!

  2. Eric says:

    Just had my second Drobo 5D fail in 3 years…the first overheated and fried 5 drives…Drobo replaced the unit only after I threatened with a consumer protection claim due to the inside of the drives melting together, however, they did not offer to try to recover the data. Just last night my second 5D failed two months out of warranty and of course, Drobo Customer support answer is for me to purchase ANOTHER Drobo to recover my data. There must be an internal fuse or something that can be replaced for less than $650 of new hardware. Needless to say, despite having invested in the SSD drive for the bottom of the unit I have moved on to a competitor (synology). I would avoid this company at all costs.

  3. I have owned Drobo boxes in the past starting with the 4 Bay FW-800 model. Never had a failure. For my 5D Thunderbolt I chose not to install the SSD card. I only work with Photoshop and the digital photo files are already backed up, on site and off site, on external SATA drives attached to my 27″ iMac.
    But I now want to increase the capacity of the 5D DROBO by pulling out one of the five 4TB drives and then insert a WD RED 6TB drive. That in itself will not give me extra space, but after the 6TB drive has been integrated, I then want to pull another of the 4TB drives and replace it with a second 6TB drive. How many 6TB drives could the 5D TB Drobo handle?

    • Larry says:


      As long as you give each drive time to be integrated – which could take up to a day – you could replace all the 4 TB drive, one at a time, with 6 TB.


  4. Søren Hebsgaard says:

    Hello Larry

    I just bought the Drobo 5D after I read the very neat read and write speeds you experienced.

    So I’m pretty surprised to find, that my Drobo reads and writes with only 40 MB/S – not exactly impressing, I would say, and far less than the 100+ you experienced.

    I will be editing 4K video, so now i’m fearing that I bought the wrong kind of equipment.

    * Is there some tricks to how you got those speeds you presented?
    * Can I do anything to improve speeds significantly?

    My setup:

    iMac 27, ultimo 2012, 24 GB RAM, Fusion Drive
    Drobo 5D
    3 x 4 TB, 7200 rpm
    250 GB mSATA SSD card

    • Larry says:


      Drobo systems are not fast, due to the software they use to provide expandability and flexibility to the RAID. It is a great choice for backup and standard def video, but not fast enough for 4K.

      Those numbers were correct as of the time I wrote the review. Drobo may have changed its software in the intervening time.


    • Eric says:

      Hey Søren –

      Did you find a solution to this or do you have to wind up going with another drive solution? I’m trying to work with 2k files via USB 3 in Avid and playback keeps stuttering. I’ve tried the same media on other drives and it works fine, but would love to salvage by $2000 purchase.

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