Raspberry Pi 4B read/write speedtests

raspberry-pi-4-read-write-speedtest-results.sh

# Micro SD

## read

sudo hdparm -Tt /dev/mmcblk0
/dev/mmcblk0:
 Timing cached reads:   2190 MB in  2.00 seconds = 1095.17 MB/sec
 Timing buffered disk reads: 126 MB in  3.04 seconds =  41.46 MB/sec

## write

dd if=/dev/zero of=/tmp/output bs=8k count=10k; rm -f /tmp/output
10240+0 records in
10240+0 records out
83886080 bytes (84 MB, 80 MiB) copied, 0.214672 s, 391 MB/s


# SSD over SATA USB 3.0

## read

sudo hdparm -Tt /dev/sda
/dev/sda:
 Timing cached reads:   2008 MB in  2.00 seconds = 1004.42 MB/sec
 Timing buffered disk reads: 956 MB in  3.05 seconds = 313.07 MB/sec
 
 ## write
 
dd if=/dev/zero of=/tmp/output bs=8k count=10k; rm -f /tmp/output
10240+0 records in
10240+0 records out
83886080 bytes (84 MB, 80 MiB) copied, 0.213062 s, 394 MB/s
 
 # for compatible USB to sata see https://jamesachambers.com/new-raspberry-pi-4-bootloader-usb-network-boot-guide/