Gear / Technical Help > Recording Media

SD 7.0 and SD Express - New SD Card Spec and Interface

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voltronic:
PCIe and NVMe for removable media is a very exciting development!


https://www.sdcard.org/consumers/choices/bus_interface/index.html

https://www.sdcard.org/press/SD_EXPRESS_A_REVOLUTIONARY_INNOVATION_FOR_SD_MEMORY_CARDS.pdf

https://www.sdcard.org/press/thoughtleadership/190214_The_Triple_Threat_of_Innovations_Supporting_SD_Express.html

morst:
whoa.

jerryfreak:
128TB in your butt

what weve all been waiting for!

morst:

--- Quote from: jerryfreak on March 29, 2019, 03:53:40 PM ---128TB in your butt

what weve all been waiting for!

--- End quote ---
thanks, but I will wait until it fits in my nostril. (MicroSD and yeah, I've checked)

jerryfreak:
none of the devices we use actually have the pins for UHS-II, right? im pretty sure at this point thats only a camera thing

i technically havent even seen a recorder that lists UHS-I as a spec, usually they just say sdhc or sdxc

i usually dont spend a ton of money on cards, just mid grade ones that work, here are some ive tested with the h2testw windows software, sequential read and write across full card. Ive seen older class 4,6, and 10 cards test slower but none really much faster than these. this is with the PCI card reader on my five-year old laptop, i will try to procure a modern usb3 reader and see if any can go higher. technically they should test a bit higher per the tests on this site:

https://havecamerawilltravel.com/photographer/fastest-sd-cards
https://havecamerawilltravel.com/photographer/fastest-microsd-cards

sandisk extreme pro 32gb microsdhc (U3/UHS-I/V30)
https://www.amazon.com/gp/product/B06XYHN68L
Writing speed: 46.9 MByte/s
Reading speed: 64.9 MByte/s

samsung evo select 32 microsdhc (class 10/U1)
https://www.amazon.com/gp/product/B06XWN9Q99
Writing speed: 23.4 MByte/s
Reading speed: 61.4 MByte/s

lexar 512GB microsdxc (U3/UHS-I/V30)
https://www.amazon.com/gp/product/B07KBQQ82D
Writing speed: 42.7 MByte/s
Reading speed: 63.7 MByte/s

sandisk 128GB ExtremePlus SDXC (U3/UHS-I/V30)
https://www.bestbuy.com/site/sandisk-extreme-plus-128gb-sdxc-uhs-i-memory-card/6299412.p?skuId=6299412
Writing speed: 41.1 MByte/s
Reading speed: 65.8 MByte/s

technically ANY of these should be fast enough for our purposes. even a mixpre6 writing (8) 24-192 channels is only writing at 4.5 MB/sec

however that doesnt mean that all cards are equal. the 512GB lexar microsdxc above will stutter and skip on my PCM-A10 when playing 24-96 FLACs (which requires under 0.5 MB/sec). I have not been able to reproduce that with the 32GB sandisk pro SDGC, or the internal memory. even though the lexar card should be plenty fast enough, id be leery to record direct to it (esp as 24/96 wavs are a higher write speed than 24/96 FLACs due to lack of compression)

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