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1.6 KiB
1.6 KiB
MH-USB Internals
MH-USB Performance
USB2 Version
From https://www.blackmoreops.com/2017/04/04/usb-and-ssd-drive-speedtest-in-linux/
USB 2.0 has a theoretical maximum signaling rate of 480 Mbits/s or 60 Mbytes/s. However due to various constraints the maximum throughput is restricted to around 280 Mbit/s or 35 Mbytes/s.
hdparm tests
$ sudo hdparm -Ttv /dev/sde1
/dev/sde1:
multcount = 0 (off)
readonly = 0 (off)
readahead = 256 (on)
geometry = 15600/64/32, sectors = 31881176, start = 2048
Timing cached reads: 16422 MB in 2.00 seconds = 8221.42 MB/sec
Timing buffered disk reads: 64 MB in 3.01 seconds = 21.28 MB/sec
dd write test
$ dd if=/dev/zero of=perf oflag=direct bs=128k count=8k
8192+0 records in
8192+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 6.94198 s, 155 MB/s
dd read test
## Clear the memory cache before benchmarking reads
$ sudo sh -c "sync && echo 3 > /proc/sys/vm/drop_caches"
$ dd if=perf of=/dev/null bs=4k
262144+0 records in
262144+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 44.5847 s, 24.1 MB/s
USB3 Version
Coming soon!
The MH-USB partition layout
The Ventoy partion layout
Document how Ventoy creates partitions for both GPT and MBR partition tables
The 16 GB model
Standard ventoy partitions
The 32 GB model
Coming soon! (special partitions to accommodate haiku.)