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SD 8.0 Specification To Allow 4GB/s Transfer Rates By Leveraging PCIe 4.0

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  • willmore
    replied
    Originally posted by zyxxel View Post

    And some flagship phones like Samsung S10/S20 has a memory card slot.

    So you can't categorize it as "cheaper" if a phone has a memory card slot, just as you can't categorize black phones as cheaper.
    I think he's trying to say that no iPhone has ever had an SD slot, so clearly phone with them much be the cheap ones.

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  • zyxxel
    replied
    Originally posted by caligula View Post

    Some flagship phones like SGS6 and iPhones don't include SD card slots.
    And some flagship phones like Samsung S10/S20 has a memory card slot.

    So you can't categorize it as "cheaper" if a phone has a memory card slot, just as you can't categorize black phones as cheaper.

    Leave a comment:


  • caligula
    replied
    Originally posted by zyxxel View Post

    Cheaper? My 512 GB phone has a memory card slot. Lots of people wants a memory card because it represents backup - and wireless backup isn't always an option.
    Some flagship phones like SGS6 and iPhones don't include SD card slots.

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  • zyxxel
    replied
    Originally posted by caligula View Post

    Cheaper phones come with SD card slots to compensate the lack of internal storage. Modern 100-500 Megapixel smart phone cameras will produce gigantic photos, especially RAW files.
    Cheaper? My 512 GB phone has a memory card slot. Lots of people wants a memory card because it represents backup - and wireless backup isn't always an option.

    Leave a comment:


  • kcrudup
    replied
    Originally posted by Paradigm Shifter View Post
    Thanks for the input. So short of going industrial grade, there isn't much of a better option.
    Well, unless you're doing sustained writes, I don't think the reputable manufacturers lie about their write speeds. That being said, I've got uSDs from 2010 that still work perfectly, aibeit a bit slow because of decade-old technology.

    Leave a comment:


  • Paradigm Shifter
    replied
    Originally posted by kcrudup View Post
    For the purposes I use (sneakernet between machines, and WoRM-like photos storage in my phones and movies storage in my tablet), I just either pick whatever's lying around (SanDisk, usually, it turns out but there's many brands), and I've got some ~20 random Micro-SDs all over and have only had one fail on me, and that one went read-only so I could get my data off. Don't recall which brand. Been burned by an Amazon fake once, too- but they just swapped it for free.

    That being said, when I implement removable storage in my clients' designs via Micro-SD, I spec out the Industrial versions of the cards (which have higher MTTF and durability) and of course design the SW to greatly limit writes (I've had to preach this to clients that think they can write GBs/day to uSD cards).
    Thanks for the input. So short of going industrial grade, there isn't much of a better option.

    Leave a comment:


  • kcrudup
    replied
    Originally posted by Paradigm Shifter View Post
    any manufacturer you would recommend instead?
    For the purposes I use (sneakernet between machines, and WoRM-like photos storage in my phones and movies storage in my tablet), I just either pick whatever's lying around (SanDisk, usually, it turns out but there's many brands), and I've got some ~20 random Micro-SDs all over and have only had one fail on me, and that one went read-only so I could get my data off. Don't recall which brand. Been burned by an Amazon fake once, too- but they just swapped it for free.

    That being said, when I implement removable storage in my clients' designs via Micro-SD, I spec out the Industrial versions of the cards (which have higher MTTF and durability) and of course design the SW to greatly limit writes (I've had to preach this to clients that think they can write GBs/day to uSD cards).

    Leave a comment:


  • kcrudup
    replied
    Originally posted by SystemCrasher View Post
    So now mere SD card would be able launch full-scale DMA attacks on whole system.
    Why regurgitate FUD that's already been debunked up-thread?

    Leave a comment:


  • SystemCrasher
    replied
    Whoa, sweet. So now mere SD card would be able launch full-scale DMA attacks on whole system. Ain't it cool?! Say bye-bye to your systems security.

    Leave a comment:


  • Paradigm Shifter
    replied
    Originally posted by kcrudup View Post

    I just had to 2nd what lethalwp said- it's not thermal throttling, but a phenomenon of both your system's cache and the cache on the device. If you run:

    Code:
    sudo dd if=/dev/zero bs=8M oflag=direct status=progress of=/dev/<flash device>
    You'll see the speed will drop really quickly at the beginning as the on-device cache is filled, then settle to the underlying flash media's true write thruput speed- which tends to be pretty crap on most cheap cards due to the storage they use. I have Micro-SD cards that do sustained writes at ~4MByte/sec and others that can do ~35MByte/sec.
    I don't think I can do anything about the cache on the device.

    I've had bad experiences with "random/cheap" microSD cards in the past (sudden death syndrome my primary concern) so only buy Sandisk (or Samsung, if I know they aren't going into an SBC, since I've had poor experiences of Samsung microSDs in ODROIDs refusing to boot...)... any manufacturer you would recommend instead?

    I've generally found the Sandisk microSDs to be pretty good, but their USB3 memory sticks, like I said, get scorchingly hot and only slow down to utterly pitiful speeds when they get that hot.

    Something to investigate in more detail when I've got time. Hm. USB reader type (USB2, or 3), SD card type, brand, capacity...

    Leave a comment:

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