03-07-2021, 03:33 PM
(This post was last modified: 03-07-2021, 03:34 PM by Arwen.
Edit Reason: Fixed typo
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Their are companies producing 2Mbit & 4Mbit SPI flash chips. Don't know how much they cost, but obviously using something smaller would be cheaper. Giga Devices, which makes compatible 128Mbit SPI flash in the PineBook Pro, (and probably other devices), makes such. May be not fast enough...
Note that USB 2 speeds are 480Mbit per second, about 30MByte per second maximum throughput. That's because it's a half duplex protocol, accounts for USB overhead and the original USB Block-only transfer was not designed for high speed storage. That's where UASP comes in to play. UASP can improve storage throughput noticeably.
So, no, USB 2 is no where near 100Mbytes per second of a eMMC or very low end hard drive.
Note that USB 2 speeds are 480Mbit per second, about 30MByte per second maximum throughput. That's because it's a half duplex protocol, accounts for USB overhead and the original USB Block-only transfer was not designed for high speed storage. That's where UASP comes in to play. UASP can improve storage throughput noticeably.
So, no, USB 2 is no where near 100Mbytes per second of a eMMC or very low end hard drive.
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Arwen Evenstar
Princess of Rivendale
Arwen Evenstar
Princess of Rivendale
