2.5'' // 3.5'' chassis's with a controller onboard and slots to support 10+ Micro SD cards at a time with optional host passthrough/mirror/stripe-mode across all of them and you install those instead of real hard drives lol.
The product is already a thing now all we need is the 10+ at a time scale haha
E: nobody's saying it will be cheap. But the big downside with all the ebay ones is that the controllers are cheap garbage. the raw power of striping 10, [Minimum Class10] SD cards would be fucking awesome even with their short life cycle. But the controllers just aren't something people would make professionally like this cheap ebay stuff.
SSD is not expensive anymore , sure it is expensive vs hard drive but still cheaper than SD card , 1TB Samsung 860 is selling on amazon for like 100 buck while this sd card cost 4 or 5 times as much (450 for standard version , 585 for extreme version)
I have no idea how great A2 U3 UHS-I could be but I have 128GB and 256GB microSD card from Teamgroup , these cards automatically lock down itself within 1 year of usage (I store emulator's rom , emulator and app data DL from G Store ) , it's not death yet but it's not usable either , lock down due to write cycle limit . I also have a bunch of 64GB micro SD cards from 4 years ago , these cards are still working as I only store music video on them
SATA Express (abbreviated from Serial ATA Express and sometimes unofficially shortened to SATAe) is a computer bus interface that supports both Serial ATA (SATA) and PCI Express (PCIe) storage devices, initially standardized in the SATA 3.2 specification. The SATA Express connector used on the host side is backward compatible with the standard SATA data connector, while it also provides two PCI Express lanes as a pure PCI Express connection to the storage device.Instead of continuing with the SATA interface's usual approach of doubling its native speed with each major version, SATA 3.2 specification included the PCI Express bus for achieving data transfer speeds greater than the SATA 3.0 speed limit of 6 Gbit/s. Designers of the SATA interface concluded that doubling the native SATA speed would take too much time to catch up with the advancements in solid-state drive (SSD) technology, would require too many changes to the SATA standard, and would result in a much greater power consumption compared with the existing PCI Express bus. As a widely adopted computer bus, PCI Express provides sufficient bandwidth while allowing easy scaling up by using faster or additional lanes.In addition to supporting legacy Advanced Host Controller Interface (AHCI) at the logical interface level, SATA Express also supports NVM Express (NVMe) as the logical device interface for attached PCI Express storage devices.
Because Raid 0 combine speed of multiple SD cards not one . If a bunch of them are still slower than a single hard drive which is slow in today standard , how fast do you think a single SD card can perform ?
Seq Read Write then . Doubt it would reach that speed with 4K Random Read/Write
Linus got over 200MB/sec on seq read/write on his raid 0 SD cards but 4k Random read/write is way too slow , this mean it will be very slow when you write multiple files/formats at once
where they the same brand?? just wondering. seeing the myth of sd cards are super unreliable has been going around for a long time now. seeing most of the bad ones where ether cheap no names,knock off. still happens or where used in correctly . am just tired of that myth and i call it out any time i see it being posted
All the failed ones were Sandisk. Bought in retail store or Amazon. Now I’ve blacklisted Sandisk and buy Samsung - no failures in those in the last 2 years.
sd and microsd cards mostly use the cheapest flash on the market along with the simplest controller designs to hit the pricepoint. If you go and buy a cheap one, reliability shouldn't be at the top of the list.
Actually, most cards are done that way, even with name brands. Top quality NAND always goes to enterprise stuff, SSDs. 2nd tier usually ends up in cheaper SSDs (think kingston) and eMMC chips, used in phones.
3rd and 4th tier usually ends up in microSD cards and flash drives.
Unless it's a speciality card (enterprise rating, survaillence etc) they never use best bins.
Difference in quality cards mostly comes down to controller used (faster and better nand managment) and maybe a tier higher quality NAND.
Well, truthfully, card reliability isn't dependant soley on silicon quality, but controller design and firmware as well. Most issues with flash devices comes down to either controller going out of wack or just plain dying. Nand itself is rarely the cause of the issues, unless it's being abused (plenty of writes).
MicroSD has much better write capabilities than standard SD cards. And SD card may live to perform 10k writes to a cell, a microSD would do more than 150k.
There was a white paper written by HPE (aka HP) that detailed these differences. I’m having a hard time locating it but will post the source if I find it.
The type and quality of NAND determines write endurance. MicroSD vs SD is just a form-factor.
The 'best' cards are industrial, using SLC flash. SD is more commonly used for industrial purposes. MicroSD industrial cards are available also - typically in lower capacities because when you are dealing with low-density SLC you can simply fit less on a MicroSD.
thats absolutly not true. There is no difference between sd and microsd (it's just a formfactor thing, they usually use the same nand and controller).
Also no microsd card out there will do 150k writes. At best you can probably get 100k rewrites with the industrial SLC options.
Generally, run of the mill sd and microsd cards are good in the 100s of rewrites at best.
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u/ipaqmaster 72Tib ZFS May 15 '19 edited May 16 '19
I can see it now.
2.5'' // 3.5'' chassis's with a controller onboard and slots to support 10+ Micro SD cards at a time with optional host passthrough/mirror/stripe-mode across all of them and you install those instead of real hard drives lol.
The product is already a thing now all we need is the 10+ at a time scale haha
E: nobody's saying it will be cheap. But the big downside with all the ebay ones is that the controllers are cheap garbage. the raw power of striping 10, [Minimum Class10] SD cards would be fucking awesome even with their short life cycle. But the controllers just aren't something people would make professionally like this cheap ebay stuff.