Sign in with no HDD?

You need some sort of memory device i believe. It doesnt have to be a hdd

Use a pen drive to store your profile on, thats how i sign in a two different machines around the house

Well first of all you can't even sign in if you don't have some sort of storage device, even for online play. (So you won't be able to recover a gamertag without a storage device)

So you will at least need some sort of storage devices such as a HDD, USB flash drive or the old Memory Unit.

So for example you have a USB flash drive and your gamertag on there, you can log on to Xbox LIVE and play online without having a HDD plugged in.

Some games require a HDD for certain online features also, the Halo games for example.

Just whack any old flash drive in there, format it, (ignore the warning about it not meeting the performance standard, that's just MS trying to get you to buy their expensive, official one) and you're dandy.

[quote user="lovechampagne"]

Just whack any old flash drive in there, format it, (ignore the warning about it not meeting the performance standard, that's just MS trying to get you to buy their expensive, official one) and you're dandy.

Lol conspiracies, i have a few that have past the test that are cheap falsh drives. I would not trust one with my data or account if it failed the test, but each to thier own.

[quote user="lovechampagne"]

Just whack any old flash drive in there, format it, (ignore the warning about it not meeting the performance standard, that's just MS trying to get you to buy their expensive, official one) and you're dandy.

[/quote]

I have never had that warning on any none MS flash drives

so the answer to your question is....... NO you can't