MacBook Pro Retina SSD vs Transcend JetDrive Lite 350 128GB vs USB 2.0 HDD speed test

As I needed more storage for my Mac I went for Transcend JetDrive Lite 350 128GB card. Sounds like a good occasion to perform quick speed test with "dd" and Blackmagick "Disk Speed Test".

Mac info.

"dd" test output:

# internal ssd
# 318348122 bytes = 318.35 MB

blob:~ marcin$ dd if=/dev/zero  of=~/Documents/data1.dat bs=1000 count=1500000
1500000+0 records in
1500000+0 records out
1500000000 bytes transferred in 4.711823 secs (318348122 bytes/sec)
blob:~ marcin$

# sd card
# 52060250 bytes = 52.06 MB

blob:~ marcin$ dd if=/dev/zero  of=/Volumes/Transcend/data2.dat bs=1000 count=1500000
1500000+0 records in
1500000+0 records out
1500000000 bytes transferred in 28.812770 secs (52060250 bytes/sec)
blob:~ marcin$

# usb 2.0 hdd
# 44119985 bytes = 44.11 MB

blob:~ marcin$ dd if=/dev/zero  of=/Volumes/backup/data3.dat bs=1000 count=1500000
1500000+0 records in
1500000+0 records out
1500000000 bytes transferred in 33.998198 secs (44119985 bytes/sec)
blob:~ marcin$

Blackmagic "Disk Speed Test" screen-shots:

Internal SSD.

Transcend JetDrive.

USB 2.0 HDD.