Posts with the tag HDD

Adjust Spindown Time for HDDs on Mac OS X

If you want to adjust the spindown time of the hard disk drives of your Mac OS X based computer, you can simply run the following command (which will set the spindown from the default 10 minutes to 30 minutes for all HDDs on your system):

pmset -a spindown...

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Formatting a USB stick on Ubuntu: Spaceloop XL 8GB bz CnMemory

Newly bought the MBR contained:

philipp@lion:~$ sudo dd if=/dev/sdb bs=512 count=1 | hexdump -C
[sudo] password for philipp: 
1+0 records in
1+0 records out
512 bytes (512 B) copied, 4.8121e-05 s, 10.6 MB/s
00000000  eb 58 90 4d 53 44 4f 53  35 2e 30 00 02 08 22 00 ...

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Test Speed Of Partitions (and therefore also Hard Disk Drives)

hdparm

The command sudo hdparm -t /dev/sda on my Samsung SpinPoint F1 HD103UJ returns:

/dev/sda:
 Timing buffered disk reads:  210 MB in  3.02 seconds =  69.63 MB/sec

seeker

Compile seeker (multithreaded) from seeker_baryluk.c using:

gcc -o seeker -O2 -march=native seeker_baryluk.c -pthread

And execute it like this (where the...

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Testing the Data Rate of a Hard Disk using dd – Here the Samsung SP2504C 250GB

If you want to see the read-speed diagram right away, click here.

When I replaced my Samsung SP2504C (250GB) by a larger (and faster one) I copied the full content of the old Samsung hard disk to the new hard disk. I used this opportunity to measure the read speed...

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Ubuntu's Automatic File System Checks

http://wiki.ubuntuusers.de/Dateisystemcheck

Fix errors automatically on startup

sudo gedit /etc/default/rcS

and change FSCKFIX=no to FSCKFIX=yes

Force a check of all ext3 partitions on next startup

sudo touch /forcefsck

View results of previous filesystem checks

less /var/log/fsck/checkroot
less /var/log/fsck/checkfs
...

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