SHREDroid for Android is a free, easy-to-use app that allows you to either manually clean all traces of deleted files from your device’s internal memory and/or SD card or set it to do so automatically after set intervals of time. That’s right. It’s like a simpler version of CCleaner’s Drive Wiper feature.

The app lets you choose the time interval between successive automatic wipes. Once said background service is enabled, you can set it to wipe or “secure delete” only when your phone is locked. During our test-run on an HTC Desire Z running MIUI, the app took roughly 4 minutes to wipe both internal and external storage the first time around.

The app seems to do what it says. Hooking up our Desire Z to the computer and scanning its SD card with a free file recovery application (Recuva for Windows 7), we found it squeaky clean, without a shred of recoverable data.

However, testing the app on an HTC Desire running a custom MIUI ROM (MIUI XJ D2EXT X-Part) and an HTC HD 2 running the original MIUI, we ran into a few problems – if the screen was allowed to time out during the wipe, it refused to wake upon pressing the power/wake button until the scan was completed, a message/call was received or sometimes, not at all. Also, a scan of the SD card with a file recovery freeware revealed that it had not been wiped completely.

As the app worked like a charm on the Desire Z, it is safe to assume that the EXT partitions / data2ext scripts used in the other two devices might very well be the cause of said problem.

Package Name : ch.ethz.infsyssec.sddroid

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