Bios update for more than 150GB hdd support

Fujitsu siemens / Amilo m1437g
October 14, 2009 at 08:45:38
Specs: Windows XP / 7 (dualboot)

I have an old Fujitsu-Siemens Amilo m1437G laptop. About a year ago I upgraded the internal harddrive to 160GB, I did not really care much that 10GB could not be allocated (my laptop could only work with 150GB total). But now, I do, because the harddrive is broken and I need to buy a new one. I have looked around and it seems that laptop harddrives (sata) of 250GB are cheaper than 160GB (sata) ones! I do not want to lose 100GB for nothing, thus I'd like to know if there is a solution which I can implement which would let me allocate more than 150GB of internal harddrive space.

- I have checked the update website, I currently have the newest BIOS version.
- Of course, dividing a harddrive in seperate partitions does not solve this problem, as the BIOS sill recognizes it as one.

Has anyone came across this problem before or does anybody maybe know of a solution?

(There is no more warranty on my laptop, due to the fact that it is about 3 years old).

Thanks in advance!


See More: Bios update for more than 150GB hdd support

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October 14, 2009 at 11:42:36
Unless you have a bios custom written you should only go to your laptop's support site for an upgrade.

Your belief the laptop can only see 150 gig of the 160 is probably due to the often misinterpreted way bytes are counted. There's an explanation here:

A bios needs to be 48-bit LBA compliant to see a drive larger than 128/120 gig (decimal/binary counting). If your bios is seeing your 160 gig drive then it is compliant and should be able to see a 250 gig drive. I can't say for sure because the bios may have limitations not related to 48-bit LBA compliance. But usually a bios that sees a 160 gig drive will see a 250 gig.

You may need to contact Fujitsu or google that model number for upgrade info.

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October 14, 2009 at 13:57:40
I agree with Dave. A 160 gb drive will show up in Windows as a little under 150gbs (because the manufacturers use decimal and Windows uses hex). If you see a (close to) 150gb drive, I suspect that your bios is 48 bit LBA compatible and you don't have a problem.

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October 14, 2009 at 16:12:32
I use 0.931 for the conversion from advertised capacity to actual capacity.

160GB x 0.931 = 148.96GB (approx)

250GB x 0.931 = 232.75GB (approx)

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Related Solutions

October 16, 2009 at 02:44:44
I appreciate your information you provided, but...

To clarify more, when I did a clean installation of Windows XP on that laptop (so while partitioning), I could not allocate more than 148 ish Gb of the 250 Gb harddisk, now clearly, this has nothing to do with the fact that you cannot allocate 100% of the capacity, this is different.

Like I said, I am pretty sure it is BIOS related (this confirms it pretty much).

There is no BIOS update (I have the newest) on their website (as they never update drivers).

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October 16, 2009 at 03:21:27
Hi, I found the manual at

The easy guide manual has settings for the bios. I noticed on page 73, you can tab to get RAID option. I don't know if this is anything to do with it.


UK MP's are thieving scumbags.
EU members are worse.

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October 16, 2009 at 11:58:23
So you went ahead and got the 250 gig drive and are still getting the same partition size? What SP version is your XP disk? You need at least SP1 to properly recognize large drives.

Does the bios see the drive correctly? What is the 250 drive's model number? Other than 'newest', what version bios do you have? The newest appears to be 1.10C.

This site claims it'll even take a 500 gig drive:

While googling I ran across another user who described his M1437G as having a 250 gig drive.

150/160 gig is not a typical bios hard drive size cutoff.

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October 17, 2009 at 03:37:12
[quote]So you went ahead and got the 250 gig drive and are still getting the same partition size? [/quote]
No, this was a while back. I returned the harddrive and got my money back, but, the thing is, as my current 160Gb harddrive is broken, I need to buy a new one, and the funny thing is, in the stores near me, 250 Gb is cheaper! (not in comparison, but directly!) than a 160 Gb internal harddrive.

[quote] This site claims it'll even take a 500 gig drive [/quote]
It does not really claim it, it might just be to get you to pay more for something which does not work, you know.

Anyways, Bubblegum, my BIOS doesn't support RAID for as far as I can see, I will have a look later on, because I gotta prepare myself for driver lessons in a few minutes.

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October 17, 2009 at 12:21:55
The page comes up as 'upgrade and replacement parts for fujitsu amilo m1437g'. How accurate it is I can't know, but by posting that a 500 gig drive is available for that model it is 'claiming' that it is compatible.

But if a 250 gig drive is cheaper than a 160 isn't the decision already made for you? Even if you only get 150/160 gig from the 250 you're getting the same results at a lower price than if you'd bought the 160.

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October 20, 2009 at 04:17:34
Correct, but, I am afraid that the harddrive might get damaged by not using the full capacity, next to that, I'd rather use the full capacity...

I am also wondering why the 250GB hdd is cheaper than the 160GB variant, they both have the same amount of cache and same rotation speeds. Only difference so far is brand.

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October 20, 2009 at 06:31:27
I will jump in here. First off the reason for the price of anything is the cost to manufacture. The way hard drives are getting more capacity is by increasing the arial density of the media itself.

Once the manufacturer makes the change to higher arial density it stops manufacturing the lower density media. Just as older RAM types have gotten more expensive, so have smaller capacity drives.

No on to your real problem.

The change from 28 bit LBA compliance (127/137GB) to 48 bit LBA compliance (144 petabytes) meant that if you have a 48 bit LBA compliant BIOS and OS you could use most any hard drive available.

Unfortunately this isn't always the case. Desktops running later versions of Windows sometimes have problems configuring hard drives in the 1/2TB range. The reasons for this are elusive but the issue does exist.

Then there is the issue of SATA I vs. SATA II. In most cases SATA II hard drives will default to running at SATA I speeds when connected to a SATA I controller. However this isn't always the case. For that reason 3.5" SATA II drives MAY come with a jumper to throttle to SATA I speeds for compatibility.

In the case of Laptops the BIOS is usually much less flexible. As eluded to above the BIOS version may need to be upgraded. Or your laptop may have a SATA I controller and virtually all current SATA hard drives are SATA II.

If WinXP can see about 237GB but the BIOS only sees 150GB I would not recommend running the laptop that way because you may end up with data corruption or loss.

It sounds like you haven't yet purchased a replacement yet. I recommend you go ahead with the 250GB. When first booting watch the POST screens to see if the BIOS is recognizing the new drive by both model and FULL capacity. If that happens then you are good to go.

If your version of WinXP contains NO service packs then you will not see the full capacity because as DAN as stated original WinXP is not 48 bit LBA compliant.

You have two choices at that point. First is to partition the drive at WinXP installation time to something less than 127/37GB and then after installation and updating the service packs you can configure the remaining space through Disk Manager.

The second method is to slipstream the latest service pack into the files on your existing WinXP CD and then burn the resultant file to CDR. Then install using that CD. Additional files can also be slipstreamed at the same time if desired.

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November 10, 2009 at 01:35:31
I have the same notebook (AMILO M1437G) with a 160 GB harddisk cloned upgrade, which works fine. However, the BIOS does not recognize at all a 320 GB harddisk I wanted to install. The BIOS is at the latest available status. The most plausible explanation I see on this forum is, that this is a SATA2 harddisk and that the AMILO M1437G only recognizes SATA1.

Does this explanation make sense to better specialists than I am?

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January 6, 2010 at 09:59:53
I have an Amilo M1437G with an 100GB Hitachi HDD.

I just installed an WD Scorpio Blue 500GB and the BIOS does not recognise it.

However I cloned the old 100GB with Acronis TrueImage version 11 to the wd 500GB. What
happened is that the
bios still (naturally) didn't recogn. the drive BUT it boots to my favourite windows XP OS.

Happy ending.

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January 6, 2010 at 16:27:52
As far as the 160GB drive goes the actual unformatted size is
160 x .93 = 148.8. So what that means is the BIOS can see at seast some 48 bit LBA compliant drives.

The issue may well be SATA I, SATA II non compliance. With desktop SATA II hard drives there is almost always a throttling jumper on the back of the drive. Maybe that is the case with 2.5" drives too.

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January 9, 2010 at 20:03:39
The problem is solved. I bought a 250Gb hdd, and somehow it is picked up now...

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January 9, 2010 at 20:18:45
We're glad you got it fixed. Thanks for posting back.

Ubuntu Cheeta, Ubuntu !

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