I have bought a two Kingston USB sticks, with 8 Gb & 32 Gb I wonder if they run to slow. It seems that the biggest run faster with Ext4.
Question: Do these two USB stick run enough fast or are they broken?
Question: Why does one USB stick run much faster with Ext4, but the other does not?
Finally my opinion is that boht USB sticks are mad of a very low cost technology in comparison with USB Hard Drive or an USB SSD, but I can be wrong. I could run hdparm -I against all my hard disk and my USB hard disk, but not against both USB Sticks.
Why do I really make this question? This question comes from: Can I Install grub on an USB and make it a rescue disk?, because I wanted to know if I could make a clean installation of Ubuntu in a USB drive. Now I see that perhaps it depends on the quality of this drive.
srs@ubuntu:~$ dmesg | grep -i sdb
[ 3.277465] sd 6:0:0:0: [sdb] 15138816 512-byte logical blocks: (7.75 GB/7.21 GiB)
[ 3.279611] sd 6:0:0:0: [sdb] Write Protect is off
[ 3.279683] sd 6:0:0:0: [sdb] Mode Sense: 2f 00 00 00
[ 3.281741] sd 6:0:0:0: [sdb] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
[ 3.288860] sdb: sdb1
[ 3.294503] sd 6:0:0:0: [sdb] Attached SCSI removable disk
srs@ubuntu:~$ dmesg | grep -i sdc
[ 175.121840] sd 7:0:0:0: [sdc] 60437492 512-byte logical blocks: (30.9 GB/28.8 GiB)
[ 175.122604] sd 7:0:0:0: [sdc] Write Protect is off
[ 175.122609] sd 7:0:0:0: [sdc] Mode Sense: 45 00 00 00
[ 175.123112] sd 7:0:0:0: [sdc] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
[ 175.127221] sdc: sdc1
[ 175.129221] sd 7:0:0:0: [sdc] Attached SCSI removable disk
srs@ubuntu:~$ sudo hdparm -Tt /dev/sdb1 // sdb1 is a partition with 6 Gb of Fat32
/dev/sdb1:
Timing cached reads: 23052 MB in 2.00 seconds = 11537.47 MB/sec
Timing buffered disk reads: 56 MB in 3.09 seconds = 18.11 MB/sec
srs@ubuntu:~$ sudo hdparm -Tt /dev/sdb2 // sdb2 is a partition with 2 Gb of Ext4
/dev/sdb2:
Timing cached reads: 22668 MB in 2.00 seconds = 11345.37 MB/sec
Timing buffered disk reads: 58 MB in 3.06 seconds = 18.95 MB/sec
srs@ubuntu:~$ sudo hdparm -Tt /dev/sdc1 // sdc1 is a partition with 16 Gb of Fat32
/dev/sdc1:
Timing cached reads: 25156 MB in 2.00 seconds = 12591.29 MB/sec
Timing buffered disk reads: 56 MB in 3.02 seconds = 18.52 MB/sec
srs@ubuntu:~$ sudo hdparm -Tt /dev/sdc2 // sdc2 is a partition with 16 Gb of Ext2
/dev/sdc2:
Timing cached reads: 23476 MB in 2.00 seconds = 11749.46 MB/sec
Timing buffered disk reads: 106 MB in 3.00 seconds = 35.30 MB/sec