Lexar Professional 1000x 128GB SDXC UHS-II Card

I have a Panasonic DMC-LX100 which can record 4K 30p video at a 100Mbps bitrate and sometimes recording would stop with an error saying the card's write speed cannot keep up. This happened with a $28 PNY Elite Performance SDXC 64GB UHS-1 90MB/sec card so I got this Lexar SDXC 128GB 150MB/sec UHS-3 card and it works perfectly for 4K 30p. UHS-1 guarantees a minimum write speed of 10MB/s while UHS-3 has a minimum of 30MB/s which is probably where a UHS-1 card falls down for 4K.I informally tested the Lexar by recording four back to back 15 minute 4K recordings and the LX100 got very warm, but there was not a single hiccup. The Lexar card also recorded 100 12MP still shots in the 11fps high speed burst mode before slowing down. The PNY could manage 95 shots before slowing down so it's not a huge difference for stills, but I wouldn't want to risk using the PNY for video and having a 4K recording stop unexpectedly. In Windows 7 with an OCZ Vertex 4 SSD and Transcend USB 3.0 card reader, I copied a 6.5GB file to and from the Lexar card and it averaged about 60-65MB/s writing TO the card and copying FROM the card averaged 87-90MB/s. Basically, this Lexar Pro card seems to be rock solid for 4K recording and I will update this review if I have any problems.On a side note, it annoys me that even though most cameras format SD cards in exFAT which no longer has a 4GB file limit size like FAT32 did, a 30 minute clip will still be broken up into 6 or so separate 4GB files. I'd like the option to record a video into one giant file. In addition, most cameras limit video recording to 30 minutes due to some EU tax applied to camcorders, but since we're in the US, I don't see why we should be stuck with this limit too. Fortunately, the US version of the upcoming Panasonic DMC-FZ2500 4K camera seems to have no recording duration limit and may even support files of up to 96GB with an SDXC card. I can't wait to see if this is true.UPDATE (09-29-2015) - I uploaded benchmark results with a new card reader Kingston Digital MobileLite G4 USB 3.0 Multi-Function Card Reader (FCR-MLG4) and CrystalDiskMark 5.0.2 x64, Windows 10 Pro.READ (MB/s): 152.7, 14.67, 152.3, 11.52WRITE (MB/s): 86.69, 1.231, 85.15, 1.180With tape over extra ports:READ (MB/s): 91.87, 13.18, 92.92, 10.04WRITE (MB/s): 75.92, 1.134, 75.50, 1.093UPDATE (11-16-2016) - My card is still going strong and I haven't had any problems. I am looking at new cameras like the Panasonic DMC-FZ2500, Fujifilm X-T2 (two UHS-II card slots!) and the Sony A6500 so I may buy more of these Lexar SDXC cards and make the old reliable one as the backup.

At the 2019 NAB convention, Lexar offered its new 128GB V60 SD card for a killer price: $40. (This was said to be a convention special.) The card was sold at that price by a few vendors, so I bought mine from Amazon -- and it is literally half the price of any other V60 SD card at this moment. As I said, a killer price.To meet the V60 spec -- which is very high performance -- the SD card needs a second row of contacts necessary to conform to the UHS-II standard. None of the pictures I could find of this Lexar 128GB V60 card showed the contacts on the back, so I crossed my fingers and ordered it. As you can see from my photo, this Lexar card does have the second row of contacts. In my experiments with the Panasonic GH5 camera, which requires a V60 SD card to record at the camera's 400 Mbps data rate, this Lexar SD card is up to the task. I recorded several clips at 400 Mbps, loaded them into Adobe Premiere, and edited them with no problem. There were no dropped frames or errors of any kind.I've only had this Lexar 128GB V60 SD card for a couple of days, but I wanted to let people know that it is the real deal. I will come back and add to this review if I have any further experiences to mention -- but so far, so good.I recommend this Lexar 128GB V60 UHS-II SD card.Edit: On Prime Day 2019, there was a killer deal on a Lexar 256 V60 UHS-II SD card -- too good to pass up. So I bought one and it is now my primary card in my Panasonic GH5 camera. Like the 128GB card before it, I immediately tested the 256GB card using the GH5's 400 Mbps high-quality video recording rate. Like the 128GB card, it was no problem recording at 400 Mbps on the 256GB card.The only complaint I have is that the package the 256GB card came in was so hard to open that I scratched the label on the SD card with the knife I used to open the package. My clumsy fault, I guess, but it would be nice to have a package that was a little easier to open. You can see the scratch in the photo, which was taken in front of the slot in the Panasonic GH5 camera where this SD card lives.I also recommend this Lexar 256GB V60 UHS-II SD card.

It broke after a few years of use so I guess that applies as a good durability. Worked as intended and never corrupted files.