How safe is encrypted disks? (data integrity)

[Wojciech Puchar]

>
> Another thing to consider is the performance hit when using geli with a high
> encryption. I have mine set to the highest (I think) bit possible and when
> transferring anything ~500MB+ it lags the system a bit to do the encryption.
>
not a problem at all for me (and most users i think) when encrypted 
partition is used only for really private data which are rarely huge 
files.