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#1
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SD vs microSD
Hello,
if the speed and quality of solid state memory depend by internal controller , what could be better SD or microSD ? For example main difference by SSD and a SD is the internal controller ( a SSD have many arm cpu as internal controller ) , so a SD could be better than a microSD because SD have more space to put inside a better controller. Is it true ? Regards -- |
#2
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SD vs microSD
Joe rock wrote:
Hello, if the speed and quality of solid state memory depend by internal controller , what could be better SD or microSD ? For example main difference by SSD and a SD is the internal controller ( a SSD have many arm cpu as internal controller ) , so a SD could be better than a microSD because SD have more space to put inside a better controller. Is it true ? Regards I'll pretend to be the plant manager for a moment. "Why don't we put the microSD product, inside an SD package ? And kill two birds with one stone." And, it gets worse. Here, we discover they used a carrier inside an SD and placed a microSD in it. https://www.reddit.com/r/mildlyinter...rd_to_find_it/ Now, how is that for a cheeky design :-) Paul |
#3
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SD vs microSD
Il 14/12/2020 17:01, Paul ha scritto:
Is it true* ? Regards I'll pretend to be the plant manager for a moment. "Why don't we put the microSD product, inside an SD package ? And kill two birds with one stone." And, it gets worse. Here, we discover they used a carrier inside an SD and placed a microSD in it. https://www.reddit.com/r/mildlyinter...rd_to_find_it/ Now, how is that for a cheeky design :-) Ok, surely you are right , my question was relative to the majoer space in the SD than in microSD , so it could use a better controller. But they are the same, microSD embedded in SD , so they are egual. I would like use SD or microSD as storage of OS , but they are slow in r/w operations. ** Paul Joe Rock |
#4
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SD vs microSD
Joe rock wrote:
Il 14/12/2020 17:01, Paul ha scritto: Is it true ? Regards I'll pretend to be the plant manager for a moment. "Why don't we put the microSD product, inside an SD package ? And kill two birds with one stone." And, it gets worse. Here, we discover they used a carrier inside an SD and placed a microSD in it. https://www.reddit.com/r/mildlyinter...rd_to_find_it/ Now, how is that for a cheeky design :-) Ok, surely you are right , my question was relative to the majoer space in the SD than in microSD , so it could use a better controller. But they are the same, microSD embedded in SD , so they are egual. I would like use SD or microSD as storage of OS , but they are slow in r/w operations. Paul Joe Rock But there are standards versions, and designs, that go faster than the Class 10 you're holding in your hand. The hardest part for the SD user, is buying computer devices with the right version of SD interface on them. Lots of computers have the "bad" SD on them. Preventing the better SD cards from being used. https://en.wikipedia.org/wiki/SD_card "Standard: 12.5 MB/s High-speed: 25 MB/s UHS-I: 50 MB/s or 104 MB/s UHS-II: 156 MB/s full-duplex, or 312 MB/s half-duplex UHS-III: 312 MB/s full-duplex, or 624 MB/s full-duplex Express: ~985 MB/s full-duplex " UHS-I , at around 95MB/sec, is the most practical. You can actually find those. The Express one, that standard is too new for much product to have appeared yet. It uses a PCI Express lane. The "Express" one, mimics NVMe, in that the UEFI BIOS needs a firmware module to read from the NVMe. Even if you fitted some sort of hardware card as an adapter, the BIOS is unlikely to want to touch it, on an older computer. Then there's the issue of whether an OS really wants to boot from SD. An obvious example is Raspberry PI and Linux, which seem to be happy to use SD. The RPi 4 recently got the ability to boot from SATA (using a USB3 to SATA adapter?), so it now has ways to get around the SD interface limitations. I don't think Windows would boot from SD. They managed to get Windows to boot from a USB stick, with Windows To Go. But that's been deprecated on Windows 10 just recently (within the last year). And we don't really know how good the wear leveling is on SD. The same applies to USB keys. I have a couple dead USB keys here, that received light usage, and they seem to have failed on me without too much effort (the sticks had Linux with persistent store loaded). I don't really know whether SD dies like that too or not. I don't have any projects here, requiring OS booting from SD, and the only SD card I own is still in fine shape. The largest SD seems to be 512GB. They might be offered for sale. There are supposed to be some higher capacity than that, but they're not available for sale from any manufacturer sales page. Which suggests they're not really ready to be used by customers. But 512GB is a pretty decent size. Enough to boot just about any SD-compatible OS, with room left over. Paul |
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