In the following guide I explain how to remove and upgrade memory in a Toshiba Satellite M100/M105 laptop. I will upgrade memory from 512MB (default size) to 2GB. This model has two memory slots. One of the memory slots can be easily accessed from the bottom but another one is hidden under the keyboard.
Let’s start with the hidden internal memory slot. In order to access the hidden slot we’ll have to remove the keyboard.
Make sure the laptop is turned off and the battery is removed.
STEP 1.
Insert a small flat head screwdriver between the speaker cover and laptop base. Lift up and remove the speaker cover.
STEP 2.
Remove two screws securing the keyboard. Release the latch located above the key F8 and lift up the keyboard.

STEP 3.
It is not necessary to disconnect the keyboard while accessing the internal memory slot. Simply turn the keyboard upside down and place it on the palm rest.
The internal memory slot is hidden under a metal cover. Remove two screws and remove the cover.

STEP 4.
Remove the original memory module installed into the internal slot. In my laptop I had a 512MB module installed.

STEP 4.
Install a new 1GB memory module into the internal slot.
Install the metal cover, keyboard and speaker cover.

Now we’ll move to the second slot located on the bottom of the laptop.
STEP 5.
Remove one screw securing the cover. Remove the cover.

STEP 6.
In my laptop this memory slot was not occupied.
Install another 1GB module into the bottom slot.

That’s it!
Both memory modules should be detected and configured automatically as soon as you turn on the laptop. You can check memory size in the BIOS setup menu or System Properties.
Toshiba Satellite M100/M105 will take up to 2GB memory total. You can install up to 1GB memory module into each slot. Use DDR2 PC-5300 SODIMM modules. You can install faster memory, for example DDR2 PC-6400 but it will slow down and run at PC-5300 speed.
UPDATE: I checked some memory sellers recently and they say that Satellite M100/M105 can handle up to 4GB RAM. If that’s true, you can install up to 2GB memory module into each slot.
Have you been able to install 4GB into your Satellite M100/M105?
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February 28th, 2012 at 2:08 pm
@ Santosa,
It should work. I believe this model can support up to 4GB RAM total.
You can install different size memory modules in different slots. 512MB+2GB combination should work.
February 26th, 2012 at 7:59 am
My Laptop is Toshiba Satellite M100 and my operating system is Windows XP HOME Edition, Ver. 2002, Service Pack 3. If I install 2GB memory in the expansion slot and leave the memory which is 512MB under the keyboard, will it work on my laptop?
Thank you.
February 14th, 2012 at 6:31 pm
Phil,
Yes, it should speed up the laptop.
February 11th, 2012 at 6:05 am
If I install either 512mb, 1GB, or 2GB memory in the expansion slot and leave the memory under the keyboard as is will it speed up my laptop? My operating system is Windows XP.
December 16th, 2011 at 12:12 pm
**Update** Ive managed to solve the issue of the black screen and beeps. You will need to update your BIOS. Look on the Toshiba website for downloads. Put in your model, and look for the latest BIOS updates. Download and install, I ran the update within Windows, no extra drive required. Pretty simple as long as you follow the directions. Now my System Information shows 1.87GB (2Gb installed). Thank you Inside My Laptop for the simple install instructions, and to all the people who left their input.
December 16th, 2011 at 10:47 am
I see a few people have had beeps on start up and a black screen, as did I.
I’m running a M105-S1021. The motherboard has a max of 2Gb, seems they were wrong.
I received a Black screen (all lights, no start up)when I removed the 512mb stick and installed 2x 1Gb sticks.
I received a Black screen and beeps (again all lights, no start up) when I had just one 1GB stick installed under keyboard.
The computer would start with the 512mb under the keyboard installed again along with 1GB underneath; however My System properties only shows 896mb ram with 1.5gb installed.
Does anyone have an explanation for the beeps and black screens?
December 6th, 2011 at 11:56 am
@ Paul K,
Are you running a 32-bit OS? It has some limitations and cannot see all 4GB or RAM.
December 5th, 2011 at 7:37 pm
In my M100-JG2, I put in 2 (two) sticks of 2Gbyte ddr2 pc2-6400 ram. Bios sees all 4Gb of it, memory check only counts about 3072 Mb. System reports 2.99GBytes. Overall, system seems faster. I believe the rest (about 1 GB) may be used for the gma 945 video but is not available for programs. Or is the extra ram just wasted? Thanks.
September 9th, 2011 at 6:24 pm
I have the same problem as John in response #35. I installed the memory, turned on the laptop and heard a few beeps but screen didn’t come back on. What do I need to do? Thanks.
August 16th, 2011 at 7:02 pm
When I installed the memory and revolted the machine beeped a few times but the screen did not come back on. Any ideas?