You can safely update to SP1 on an M1530.  The package you are looking at is the "full install", meaning that it has every possible SP1 update in it.  The "network install" package only downloads the updates applicable to your system.  You can use the full update, but you'll have to go through the hassle of downloading it all first.

 

You can download and install the service pack manually. It's bigger and takes longer to install though. There may be however small incompatibilities with some Drivers. This is why it does not appear immediately on Windows Update to avoid problems.

 

I have to update a few of my drivers and then SP1 appeared on the Windows updates. Its was a lot smaller and didn't take long to install.

 

I had to update. 

 

Audio
Graphics
Wireless
Fingerprint reader

 

I have had no problems doing this and installing SP1.

I updated to PS1 using Microsofts Windows Update.

 

Let it scan you laptop for the updates it needs, it compiles a list, and begins to down load it to your laptop.

 

In my case, it was about 66mb.

 

After it down loads, it installs in 3 phases automagicaly rebooting after each phase.

 

Update takes nearly 1 hour to complete.

 

The ONLY odd thing I noticed, is Dell's Media Direct, no longer lauches into it native state.

It now only runs under Windows.  Not really a big deal for me, I watch DVDs on my large flat screen

and home theater in the living room.