[Desire Android Development] jukyO:
Thats our food, not some fruit :)

userdata, bigger 1Gb, second ext4 partition:

ubuntu:/media/userdata$ ls -la
total 80
drwxrwx--x 17 belina belina 4096 2011-10-07 14:30 .
drwxr-xr-x 6 root root 4096 2011-10-08 11:07 ..
drwxrwxr-x 2 belina belina 4096 2011-10-08 11:05 anr
drwxrwx--x 2 belina belina 4096 2011-10-07 14:31 app
drwxrwx--x 2 belina belina 4096 2011-09-10 10:30 app-private
drwx------ 5 belina belina 4096 2011-10-08 11:06 backup
-rw-r--r-- 1 root root 806 2008-08-01 14:00 copy_data.sh
drwxrwx--x 2 belina belina 12288 2011-10-07 14:28 dalvik-cache
drwxr-xr-x 2 root root 4096 2011-10-07 14:30 data
drwxr-x--- 2 root 1007 4096 2011-09-10 10:30 dontpanic
drwxr-xr-x 3 root root 4096 2011-10-07 14:28 gscript
drwxr-xr-x 2 root root 4096 2011-09-10 10:31 local
drwxrwx--- 2 root root 4096 2011-09-10 10:30 lost+found
drwxrwx--t 2 belina 9998 4096 2011-10-07 14:31 misc
drwx------ 2 root root 4096 2011-10-07 14:31 property
drwxrwxrwx 2 belina belina 4096 2011-09-10 10:30 sdcard
drwx------ 3 belina belina 4096 2011-10-07 14:28 secure
drwxrwx--x 2 belina belina 4096 2011-10-07 14:31 system

Smaller, 300Mb ext4:

ubuntu:/media/extdata$ ls -la
total 440
drwxr-xr-x 110 root root 4096 2011-10-07 14:29 .
drwxr-xr-x 6 root root 4096 2011-10-08 11:07 ..
drwxr-x--x 2 10038 10038 4096 2011-09-10 11:00 android.tts
drwxr-x--x 4 10074 10074 4096 2011-10-07 14:28 au.com.phil.minepro
drwxr-x--x 3 10051 10051 4096 2011-10-07 14:28 browser.dolphin.firefox.opera.chrome.fennec.license
drwxr-x--x 5 10064 10064 4096 2011-10-07 14:28 ch.racic.android.marketenabler
drwxr-x--x 2 10018 10018 4096 2011-09-10 11:00 cmupdaterapp.ui
drwxr-x--x 3 10042 10042 4096 2011-10-07 14:28 com.adobe.flashplayer
drwxr-x--x 5 10049 10049 4096 2011-10-07 14:28 com.anddoes.fancywidget.pro
drwxr-x--x 2 10000 10000 4096 2011-09-10 11:00 com.android.appshare
drwxr-x--x 2 10003 10003 4096 2011-09-10 11:00 com.android.bluetooth
drwxr-x--x 12 10004 10004 4096 2011-10-07 14:28 com.android.browser
drwxr-x--x 2 10005 10005 4096 2011-09-10 10:59 com.android.calculator2
drwxr-x--x 2 10006 10006 4096 2011-09-10 11:00 com.android.calendar
drwxr-x--x 2 10008 10008 4096 2011-09-10 11:00 com.android.certinstaller
drwxr-x--x 2 10001 10001 4096 2011-09-10 10:59 com.android.contacts
drwxr-x--x 2 10010 10010 4096 2011-09-10 10:59 com.android.defcontainer
drwxr-x--x 2 10011 10011 4096 2011-09-19 16:41 com.android.deskclock
drwxr-x--x 2 10013 10013 4096 2011-09-10 11:00 com.android.email
drwxr-x--x 2 10014 10014 4096 2011-09-10 11:00 com.android.fileexplorer
drwxr-x--x 7 10015 10015 4096 2011-10-07 14:28 com.android.gallery
drwxr-x--x 2 10020 10020 4096 2011-09-10 11:00 com.android.htmlviewer
drwxr-x--x 2 10021 10021 4096 2011-09-10 11:00 com.android.inputmethod.latin
drwxr-x--x 7 10057 10057 4096 2011-10-07 14:28 com.androidlab.gpsfix
drwxr-x--x 2 10022 10022 4096 2011-09-10 10:59 com.android.launcher
drwxr-x--x 5 10028 10028 4096 2011-10-07 14:28 com.android.mms
drwxr-x--x 2 belina belina 4096 2011-09-10 11:00 com.android.monitor
drwxr-x--x 2 10030 10030 4096 2011-09-10 11:00 com.android.packageinstaller
drwxr-x--x 2 1001 1001 4096 2011-09-10 10:59 com.android.phone
drwxr-x--x 2 10001 10001 4096 2011-09-10 10:59 com.android.providers.applications
drwxr-x--x 2 10007 10007 4096 2011-09-10 10:59 com.android.providers.calendar
drwxr-x--x 2 10001 10001 4096 2011-09-10 10:59 com.android.providers.contacts
drwxr-x--x 2 10012 10012 4096 2011-09-10 10:59 com.android.providers.downloads
drwxr-x--x 2 10012 10012 4096 2011-09-10 10:59 com.android.providers.downloads.ui
drwxr-x--x 2 10012 10012 4096 2011-09-10 10:59 com.android.providers.drm
drwxr-x--x 2 10012 10012 4096 2011-09-10 10:59 com.android.providers.media
drwxr-x--x 2 belina belina 4096 2011-09-10 10:59 com.android.providers.settings
drwxr-x--x 2 belina belina 4096 2011-09-10 10:59 com.android.providers.subscribedfeeds
drwxr-x--x 2 1001 1001 4096 2011-09-10 10:59 com.android.providers.telephony
drwxr-x--x 2 belina belina 4096 2011-09-10 10:59 com.android.providers.telocation
drwxr-x--x 2 10001 10001 4096 2011-09-10 10:59 com.android.providers.userdictionary
drwxr-x--x 2 belina belina 4096 2011-09-10 11:00 com.android.server.vpn
drwxr-x--x 2 belina belina 4096 2011-09-10 11:00 com.android.settings
drwxr-x--x 2 belina belina 4096 2011-09-10 11:00 com.android.sidekick
drwxr-x--x 3 10033 10033 4096 2011-10-07 14:28 com.android.soundrecorder
drwxr-x--x 2 10027 10027 4096 2011-09-10 11:00 com.android.spare_parts
drwxr-x--x 2 1001 1001 4096 2011-09-10 11:00 com.android.stk
drwxr-x--x 2 belina belina 4096 2011-09-10 11:00 com.android.systemui
drwxr-x--x 2 1030 1030 4096 2011-09-10 11:00 com.android.thememanager
drwxr-x--x 2 1030 1030 4096 2011-09-10 11:00 com.android.updater
drwxr-x--x 2 10040 10040 4096 2011-09-30 10:56 com.android.vending
drwxr-x--x 2 10024 10024 4096 2011-09-10 11:00 com.android.vending.updater
drwxr-x--x 2 10041 10041 4096 2011-09-10 10:59 com.android.voicedialer
drwxr-x--x 2 10023 10023 4096 2011-09-10 11:00 com.android.wallpaper.livepicker
drwxr-x--x 7 10068 10068 4096 2011-10-07 14:28 com.aurorasoftworks.quadrant.ui.standard
drwxr-x--x 5 10048 10048 4096 2011-10-07 14:28 com.blogspot.phonecoder.ccnafree
drwxr-x--x 5 10076 10076 4096 2011-10-07 14:28 com.cootek.smartinputv5
drwxr-x--x 7 10055 10055 4096 2011-10-07 14:28 com.eclipsim.gpsstatus2
drwxr-x--x 6 10052 10052 4096 2011-10-07 14:28 com.estrongs.android.pop
drwxr-x--x 4 10060 10060 4096 2011-10-07 14:28 com.gmail.anolivetree.imageshrinklite
drwxr-x--x 6 10054 10054 4096 2011-10-07 14:28 com.google.android.apps.plus
drwxr-x--x 2 belina belina 4096 2011-09-30 10:56 com.google.android.backup
drwxr-x--x 2 10016 10016 4096 2011-09-19 16:41 com.google.android.gm
drwxr-x--x 2 10017 10017 4096 2011-09-19 16:41 com.google.android.gsf
drwxr-x--x 2 10017 10017 4096 2011-09-10 10:59 com.google.android.location
drwxr-x--x 2 10019 10019 4096 2011-09-10 11:00 com.google.android.partnersetup
drwxr-x--x 2 10017 10017 4096 2011-09-10 11:00 com.google.android.syncadapters.calendar
drwxr-x--x 2 10017 10017 4096 2011-09-10 11:00 com.google.android.syncadapters.contacts
drwxr-x--x 2 10036 10036 4096 2011-09-30 10:56 com.google.android.talk
drwxr-x--x 7 10079 10079 4096 2011-10-07 14:28 com.google.android.youtube
drwxr-x--x 7 10056 10056 4096 2011-10-07 14:28 com.highwaynorth.gpstoolbox
drwxr-xr-x 7 10080 10080 4096 2011-10-07 14:28 com.keramidas.TitaniumBackup
drwxr-x--x 2 10000 10000 4096 2011-09-24 09:09 com.lge.android.hime
drwxr-x--x 4 10077 10077 4096 2011-10-07 14:28 com.lge.clockweatherwidget
drwxr-x--x 9 10047 10047 4096 2011-10-07 14:28 com.magicandroidapps.bettertermpro
drwxr-x--x 6 10066 10066 4096 2011-10-07 14:28 com.maxmpz.audioplayer
drwxr-x--x 5 10073 10073 4096 2011-10-07 14:28 com.mhuang.overclocking
drwxr-x--x 2 belina belina 4096 2011-09-10 11:00 com.miui.antispam
drwxr-x--x 2 10002 10002 4096 2011-09-10 11:00 com.miui.backup
drwxr-x--x 2 10025 10025 4096 2011-09-28 11:03 com.miui.camera
drwxr-x--x 2 10009 10009 4096 2011-09-10 11:00 com.miui.cloudservice
drwxr-x--x 2 belina belina 4096 2011-09-10 11:00 com.miui.fmradio
drwxr-x--x 2 10029 10029 4096 2011-09-10 11:00 com.miui.notes
drwxr-x--x 6 10026 10026 4096 2011-10-07 14:28 com.miui.player
drwxr-x--x 2 10039 10039 4096 2011-09-10 11:00 com.miui.providers.userbook
drwxr-x--x 2 10034 10034 4096 2011-09-10 11:00 com.miui.supermarket
drwxr-x--x 2 10035 10035 4096 2011-09-10 11:00 com.miui.uac
drwxr-x--x 2 10032 10032 4096 2011-09-10 11:00 com.miui.wallpaper
drwxr-x--x 2 10044 10044 4096 2011-09-30 22:30 com.miui.weather
drwxr-x--x 7 10075 10075 4096 2011-10-07 14:29 com.nitrodesk.nitroid
drwxr-x--x 7 10065 10065 4096 2011-10-07 14:29 com.photobucket.android
drwxr-x--x 6 10078 10078 4096 2011-10-07 14:29 com.quoord.tapatalkxda.activity
drwxr-x--x 6 10043 10043 4096 2011-10-07 14:29 com.rovio.angrybirds
drwxr-x--x 2 10031 10031 4096 2011-09-10 11:00 com.svox.pico
drwxr-x--x 3 10070 10070 4096 2011-10-07 14:29 com.zikyhd.android.RILInfos
drwxrwx--x 2 belina belina 4096 2011-10-07 14:30 data
drwxr-x--x 6 10045 10045 4096 2011-10-07 14:29 dk.mvainformatics.android.babymonitor
drwxr-x--x 4 10059 10059 4096 2011-10-07 14:29 jonasl.ime
drwxr-x--x 5 10067 10067 4096 2011-10-07 14:29 la.droid.qr
drwx------ 2 root root 4096 2011-09-10 10:31 lost+found
drwxr-x--x 5 10062 10062 4096 2011-10-07 14:29 lu.artou.marketenablercodes
drwxr-xr-x 2 root root 4096 2011-09-10 10:31 misc
drwxr-x--x 11 10050 10050 4096 2011-10-07 16:35 mobi.mgeek.TunnyBrowser
drwxr-x--x 2 10037 10037 4096 2011-09-10 11:00 net.cactii.flash2
drwxr-x--x 5 10046 10046 4096 2011-10-07 14:29 net.jonrichards.batterycalibrator.ui
drwxr-x--x 4 10058 10058 4096 2011-10-07 14:29 org.jraf.android.nolock
drwxr-x--x 7 10069 10069 4096 2011-10-07 14:29 org.uguess.android.sysinfo.pro
drwxr-x--x 3 10063 10063 4096 2011-10-07 14:29 ru.org.amip.MarketAccess
drwxr-x--x 5 10053 10053 4096 2011-10-07 14:29 xcxin.filexpert
drwxr-x--x 7 10071 10071 4096 2011-10-07 14:29 zsj.android.uninstall

Hope it can help you to figure out which partition is for what.

EDIT:

strand explained which partition is used for which data.

Zdravo,

jukyO