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Crucial M550 CT256M550SSD4 M.2 Type 2280 256GB SATA 6Gb/s MLC Internal Solid State Drive (SSD)
  • Verified Owner
  • Owned For: 1 month to 1 year

Pros: This new drive form factor is an in expensive alternative to a traditional SSD and is very fast

Cons: There is a serious Driver issue that requires a fix outlined below.
After trying to get Gigabyte support to resolve, I spoke with support at Crucial and found they really had no clue as to why this was happening. During the discussion, they provided a few links to suggest fixes ranging from adjusting the HIPM & DIPM to tweaking the registry.
Working through these I found what the ROOT CAUSE is and how to fix the problem. Here is a summary of the cause and how to fix.
The real issue is the Intel SATA Chipset requires and iaStor drivers. The iaStor drivers were changed a few revs back to include Load Protection Modules (LPM) where the drivers try to manage faults in low loads at the Power Supply Unit (PSU) level. This change introduced a flaw in how the PSU handles power to SSD and Spindle drives to prevent too low of power being fed to these devices. The change did not take into account the M.2 format.
A Traditional SSD has a slow bleed capacitor to maintain its operation and the normal mechanical drive can simply shut down without issue. The M.2 format does not appear to have the SSD slow bleed capacitor and therein is the problem.
The iaStor driver’s simply cut power at the PSU under LPM, which causes the M.2 format drive to simply disappear in BIOS, thus the need to power down the PSU to rediscover the M.2 drive. This may be Crucial or in my case Gigabyte issue but I suspect it’s the iaStor driver only since this is happening across a wide range of motherboards and may be happening with other M.2 manufacturers as well.

Let’s hope the manufacturers get this information and adjust as needed so we don’t have to perform manual adjustments going forward.

Other Thoughts: THE FIX:
Through trial and error, the issue is really very simple. The LPM in the iaStor drivers must be turned off since it is on by default. The registry entries for this don't exist for the LPM as installed by the driver. Manual registry entries are needed to turn off LPM for the specific iaStor ports supporting the M.2 drive are required to fix this problem. You won’t want to shut off all LPM ports since they are needed for the other drive form factors to function properly
Each motherboard or iaStor driver may setup its own registry entries. The default single or fresh install should be [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\iaStor\Parameters]. However, my current installation has three variants (same location) iaStorA, iaStorF and iaStorV. Locate the one that includes the ‘Device’ Key and use the path in building your registry dword strings shown below replacing the "iaStor" as needed. Remember only include the ports associated with the M.2 drive, if you want to include them and have the LPM mode enable, change the dword value to “dword:00000001”.
I copied and pasted only Port 4 & 5 in to a text file named ‘LPM.reg’, for my Gigabyte MB since those are the ports supporting the M.2 drive. Once you have the file created, double click on it to load the registry entries via RegEdit. If the path is good, you will see a message the keys were successfully loaded. If the path is not valid, an error message will ask if you what to create them – say no and correct the path in the file.

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\iaStor\Parameters\Port0]
"LPM"=dword:00000000
"LPMDSTATE"=dword:00000000
"DIPM"=dword:00000000

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\iaStor\Parameters\Port1]
"LPM"=dword:00000000
"LPMDSTATE"=dword:00000000
"DIPM"=dword:00000000

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\iaStor\Parameters\Port2]
"LPM"=dword:00000000
"LPMDSTATE"=dword:00000000
"DIPM"=dword:00000000

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\iaStor\Parameters\Port3]
"LPM"=dword:00000000
"LPMDSTATE"=dword:00000000
"DIPM"=dword:00000000

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\iaStor\Parameters\Port4]
"LPM"=dword:00000000
"LPMDSTATE"=dword:00000000
"DIPM"=dword:00000000


[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\iaStor\Parameters\Port5]
"LPM"=dword:00000000
"LPMDSTATE"=dword:00000000
"DIPM"=dword:00000000

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SAMSUNG 840 EVO MZ-7TE250BW 2.5
  • Owned For: more than 1 year

Pros: They work

Cons: These drives are slow compared to many others. Really disappointing for what should be a very fast drive.

Other Thoughts: Running two in a mirror raid configuration and they are slower than my Sata II segate drives they replaced. I'm told a few other techies that these in a RAID will revert to ATA interface speeds, so this may be the issue. I have not seen confirmation but it makes sense.

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Plextor M5P Series PX-512M5Pro 2.5
  • Verified Owner
  • Owned For: more than 1 year

Pros: This is one of the fastest SSD's on the market. It screems past the Samsung I have.
Has been operating flawlessly for over a year.

If you've been dissapointed by the other drive manufacturers, you won't be with Plextor. The are top noch!

Cons: One con is that the intial drive died and because its electroninc memory all data will always be a total loss.
RMA and had a NEW one in 3 days.

Other Thoughts: Bought the Plextor and a Samsung Pro at the same time. The Plextor simply out performs anything I've seen.
The Drive die in the first two weeks but Plextor replaced it with overnight shipping at their cost.

I've worked with virually all storage manufacturers over the years and know their RMA policy is to provide Refurbs if they have them over new stock. This is just the cost of doing business. I too get torqued with the though of RMA a new out of the box drive, but look at it like, ok the one they are shipping has been bench tested which is more than most production line units.
Additionally, I have and will continue to tell everyone how great both the Plextor SSDs are but also mention the quality customer service they provide when you do need them.

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Daniel W.'s Profile

Display Name: Daniel W.

Date Joined: 11/16/01

  • Reviews: 43
  • Helpfulness: 26
  • First Review: 05/13/06
  • Last Review: 09/09/14
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