Raspberry Pi on Junian Dev

Disable Mail Notification from Cron

author@junian.dev (Junian Triajianto) — Thu, 14 Jan 2021 11:50:06 +0700

Have you ever use your Raspberry Pi terminal session and you see following message randomly?

You have new mail in /var/mail/pi

Maybe you’re wondering who’s sending these emails. To know that, you can type mail to check your inbox. If you see several messages like following line, then it’s caused by cron job.

$ mail
"/var/mail/pi": 2047 messages 2047 new
>N   1 Cron Daemon        Wed Jan 13 18:50  22/681   Cron <pi@retropie> /home/pi/go/bin/gonetweet
 N   2 Cron Daemon        Wed Jan 13 18:51  21/3540  Cron <pi@retropie> /home/pi/autotweet.sh
 N   3 Cron Daemon        Wed Jan 13 18:51  22/681   Cron <pi@retropie> /home/pi/go/bin/gonetweet
 N   4 Cron Daemon        Wed Jan 13 18:52  22/681   Cron <pi@retropie> /home/pi/go/bin/gonetweet
 N   5 Cron Daemon        Wed Jan 13 18:52  21/3540  Cron <pi@retropie> /home/pi/autotweet.sh

To stop cron sending you emails, you can just add >/dev/null 2>&1 to the end of your cron job.

How to Fix Raspberry Pi Slow USB Drive Write Speed Problem

author@junian.dev (Junian Triajianto) — Sat, 28 Mar 2020 13:05:17 +0700

One thing I notice after owning some Rapsberry Pis for about 4 years, the default write speed on one of its USB port is very slow, especially when you attach an external HDD with NTFS format.

To see what I mean, let’s check the write speed directly.

I assume you’re using Raspbian, or its derivative, as the OS.

First, change the working directory to your attached usb drive.

cd /media/pi/$HARD_DRIVE_LABEL

Then we can simulate file writing using dd tool. The following command will create binary file called test.bin with 1000 MB of size (or roughly 1 GB).

How To Convert PSP ISO Games To CSO on Raspberry Pi

author@junian.dev (Junian Triajianto) — Fri, 27 Mar 2020 12:43:42 +0700

One of my hobbies right now is retrogaming. I try to catch up with some old PSP games that I never had a chance to play when I was a kid.

Thanks to the advanced emulation technology today, I can play those games on my phone today.

One problem with PSP game is that the game file (we usually call it ROM) is relatively big. A single PSP game can take around 0.7 GB to 1.5 GB of disk space. The internal storage of my phone can only store around 10 games. I also purchase a 256 GB microSD card, the Samsung EVO Select brand one, to store more PSP ROMs. I quickly running out of space the more my collection grows, since I also have ROMs for other game systems.