Formattata come ext4, da Linux con GParted:
codice:
bash-4.1# sync; time (busybox dd if=/dev/zero of=/data/app/test.dat bs=1M count=25; sync); rm /data/app/test.dat
25+0 records in
25+0 records out
26214400 bytes (25.0MB) copied, 2.546661 seconds, 9.8MB/s
real 0m3.618s
user 0m0.000s
sys 0m0.594s
bash-4.1# sync; time (busybox dd if=/dev/zero of=/data/app/test.dat bs=1M count=25; sync); rm /data/app/test.dat
25+0 records in
25+0 records out
26214400 bytes (25.0MB) copied, 1.330109 seconds, 18.8MB/s
real 0m2.057s
user 0m0.000s
sys 0m0.570s
bash-4.1# sync; time (busybox dd if=/dev/zero of=/data/app/test.dat bs=1M count=25; sync); rm /data/app/test.dat
25+0 records in
25+0 records out
26214400 bytes (25.0MB) copied, 1.882050 seconds, 13.3MB/s
real 0m2.180s
user 0m0.000s
sys 0m0.523s
bash-4.1# sync; time (busybox dd if=/dev/zero of=/data/app/test.dat bs=1M count=25; sync); rm /data/app/test.dat
25+0 records in
25+0 records out
26214400 bytes (25.0MB) copied, 1.354065 seconds, 18.5MB/s
real 0m1.793s (~14MB/s!!)
user 0m0.000s
sys 0m0.484s
Non so se sia perché l'ho riformattata, perché sto usando Ext4, perché ho formattato da Linux, per via di tutte e tre le cose insieme ma io ce l'avevo fissa a 1MB/s.
GParted is your friend. Procuratevi un computer Linux, fate il backup e riformattate anche voi (non serve ripartizionare). E' tutta un'altra musica.