Updating samsung 840 firmware

SO everyone has said that you cannot update firmware from an external optical bay. This is NOT TRUE for ALL macs. I have an early macbook 2011 and had no problem updating this ssd drive from optical drive. Burned ISO to dvd, put in optical drive, restarted booting from cd drive ("Windows" came up) then followed on screen instructions. SO give it a try at least. See what happens!

sharinganuser,
everyone has not said that — I, for one, have never said that.

Similar Messages

Update Samsung SSD Firmware on Mac

Hello,
I am a proud owner of MacBook Pro i5 with a Samsung 128 SSD.
Recently, Samsung issued a firmware update. Normally, I'd have to take the SSD out, plug it into a SATA Windows machine, create bootable USB and update the firmware there.
Does anyone know any workaround on how to update SSD firmware on my Mac without having to plug SSD into windows machine? I recently found some blog about creating bootable WinXP CD and install firmware that way. I tried that, but it did not work, as I got some error messages while creating the BootCD and then the SSD updater from Samsung did not work...
I need this firmware because of TRIM support for Win7.
Thanks in advance,
Milan

Thanks for your answer, but thats not gonna happen, since the firmware needs to be started from a USB bootable disk. You cannot boot it off of BootCamp partition, since firmware update wipes all data from SSD.

How to update Samsung SSD firmware?

This seems like such a simple thing to do, but I'm getting stuck. My computer suddenly stopped talking to my SSD a few weeks ago, and after some help on here I was able to determine it was due to a bad internal SATA cable. But unfortunately, there still appears to be an issue with the SSD: it will eject and remount repeatedly when I connect it in its USB enclosure. I realized the firmware was out of date, and I am hoping that will fix the issue.
But I'm not sure exactly what steps need to be taken. I downloaded the update, an ISO file, and I have burned it do a disc, but the disc won't start the install process. I've read I need to boot from this disc (hold Alt when powering up), but doing this just takes me to recovery mode and I don't know what to do from there. It seems like this whole process would be a lot easier on Windows. Could I just install the update through a Windows computer even though the drive is formatted for my Mac?
Thanks for your help!

This
http://www.samsung.com/global/business/semiconductor/samsungssd/downloads.html
says:
Below you will find the latest firmware downloads for recent Samsung-branded SSDs.
ISO files may be used only via DOS using a bootable CD/DVD.
Yes, you can/have to update the firmware on a PC

How to update firmware on Samsung 840 pro SSD?

I just bought a samsung 840 pro SSD and am trying to look for a way to upgrade the firmware to the latest version. Apparantly it is only possible via windows, has anyone found a way to do it on a mac? I received my SSD yesterday and there was a firmware update released by Samsung on the 13TH December but i am unable to update.
Any help would be greatly appreciated.
Thanks

This is why I don't recommend Samsung SSDs to Mac owners. Crucial, OCZ, SanDisk, Intel, and Plextor (I think) have firmware updates that can be performed on a Mac. While I wouldn't get a SanDisk or Intel for other reasons, it wouldn't be because of inability to update the firmware.

Z87-G45 Gaming not able to install Win7 x64 with Samsung 840 EVO

I have a brand new:
i5 4570
MSI Z87-G45 Gaming
250GB Samsung 840 EVO
1x 8GB Corsair ValueRam DDR3 1600
I got everything hooked up properly, but I am not able to install Win7 x64 through an USB pen drive (Kingston Datatravel 32GB USB3) I have a proper official and Legit MSDN ISO, formatted by the Win7 USB tool from MS itself.
Note that i do not have an optical device (DVD) installed so I cannot use it 'the old way'.
Bios settings are okay, everything is recognized
USB Legacy - Kingston Datatraveler
HDD Legacy - Samsung 840 EVO
Win7 setup loads properly; but before I can select the Harddrive / SSD to install Win7 on I get prompted that additional (3rd party) drivers are needed to proceed. The volume is not recognized. This happens 9 out of 10 times. In the 10% cases I do get the option to format the SSD and/or create partitions. However, installation fails after all, cannot load or find file ...
What I've tried so far:
Switch out the SATA cables and power cables
Switch through the various SATA ports on the MB 1 through 6
Tried UEFI and UEFI/Legacy (UEFI doesn't seem to work at all)
Update UEFI to V 1.50
All the above result in the case mentioned.
I have succesfully installed the SSD in an other PC, using the same pen drive and ISO and it worked like a charme, thus ruling out that the SSD, pen drive or image is corrupt.
Even when I switched out the SSD after Win7 setup has succesfully copied, unpacked and installed all the files (doing this on the other machine where it works like a charm). Then switching it to the MSI Z87...it fails; starting the setup procedure right from the start, like nothing was ever written on the SSD...
Finally i turned to Win8, and guess what, it installed without any glitches on the MSI Z87
What am I missing here, I would really want to install Win7 instead of Win8
Forgot to enable / disable something in the UEFI? I really don't know, google doesn't give much information on this specific problem (SSD is recognized properly by the BIOS / UEFI as far as I can tell)
The only thing I have not tried out so far is updating the Samsung SSD firmware to the 1.0 version which has been release 3 days ago...
Any clues, tips, hunches??

Quote from: Bernhard on 25-October-13, 18:33:41
Did you disable Secure Boot in the BIOS? If not, then Win7 won't load.
Hmmm not sure, thanks for the reply, will have to look into that later today!
I didn't change it from the default setting I think, unless it is part of the Win8 features in the UEFI. All where disabled by default, and I kept them disabled.
Where is Secure Boot listed in the UEFI, and any idea wether it is enabled by default?
::EDIT::
Found it in some screenshots, I cannot recall from the top of my head wether it was enabled or disabled, allthough my gutt feeling says it already is disabled.
http://cdn.pcper.com/files/imagecache/article_max_width/review/2013-05-31/09-MSI_SnapShot_23.gif
http://cdn.pcper.com/files/imagecache/article_max_width/review/2013-05-31/10-MSI_SnapShot_24.gif
Nice overview of the entire UEFI btw: http://www.pcper.com/reviews/Motherboards/MSI-Z87-GD65-Gaming-Motherboard-Review/BIOS-Features-continued

MSI GT70 0NC 494 - Samsung 840 Evo Problem

I recently brought a Samsung 840 Evo 500GB to replace the WD Black HDD on my MSI GT70-0NC-494 laptop. OS is Windows 8. Im going type out pretty much how I ended up to where I am right now in hopes that maybe someone could catch where I went wrong.
So here's the story:
The cloning process went smoothly and I was able to load the OS from the SSD without any problems. Then I immediately updated the firmware and I set the optimizations using the Magician software.
I ran CrystalDiskMark and had speeds around ~300MB for both read and writes on the sequential test. Thought that my speeds were kind of slow when comparing them to the others I've seen. AHCI is on. I know my laptop has a SATA 2 and SATA 3 slot but I did plug the SSD in the SATA 3. SATA 3 connection is confirmed through Intel RST application and Samsung Magician. The speed is just not around the ballpark of what everyone is getting.
Ok, let's see the speeds with Rapid Mode so I turned on Rapid Mode and restarted. Then I get a "Start PXE over IPv6/4" message which then leads to the BIOS screen. Turn off laptop, turn it on, and get the same message. Turn off laptop again, turn it on, and the OS loads this time.
I thought that was weird but whatever I got to the OS, I thought. Open up Task Manager to see how Rapid Mode affects my RAM capacity since my regular usage already puts me ~1.5GB below max. 1.9GB shows up on RAM. Thought I'd be starting closer to 3GB. Then again, Im not entirely sure on how Rapid Mode works so whatever. Run the benchmark test through Magician software.
(This pic was from after I reinstalled Win 8 but the performance drop was similar)
Ok, , the read speeds is now garbage. Did the test on CrystalDiskMark and it shows similar results. It was late at night and Im feeling tired so I keep my laptop idle overnight to see if that would help. Nope, read speeds are still garbage. Surprisingly enough, CrystalDiskMark would show write speeds for sequential hitting ~1000MB/s so it seems that the write process is somewhat fine. The read process seems like it's broken.
So I turn off Rapid Mode and see if that fixes my read speeds. Restart. Get BSOD on startup. Turned laptop on and off multiple times to see if anything works but no avail. Thankfully I created a set of recovery disks 2 days ago so I immediately run that now. I was planning to restore the OS to factory install anyways so its fine.
OS is restored. At this point Im scared of installing the Samsung Magician software so I make a restore point. This time I want to see what happens if I install the software and run Rapid Mode through Win 8.1.
Seems like I can't just upgrade to 8.1 without installing a bunch of updates first so I do that. I got impatient so I went ahead and installed Magician and did the optimizations. CrystalDiskMark showed ~300MB/s for read and ~400MB/s for write. Ran the Magician benchmark and it produced the light blue bars on the screenshot above.
Let's try Rapid Mode now. Turn Rapid Mode on, restart, and I am again greeted with the "Start PXE over IPv6/4" message before hitting the BIOS. Now Im telling myself that I messed up again. Turned off the laptop and turned it on. OS is back. Awesome, only 1 try.
Did benchmarks on Magician which again showed that my read speeds were garbage (dark blue bars). I'm not even going to touch Rapid Mode for fear of having to reinstall the OS again. So now Im trying to upgrade to Win 8.1 and see if that fixes something.
Download 8.1, restart, I get some BSOD message with the code "0xC1900101 - 0X20017", restart through BIOS, and I get an error saying that 8.1 failed and Im being reverted to 8. Desktop loads up, I check Magician and my 840 Evo doesnt even appear on the drop down list. The software even says Rapid Mode is disabled even though I can see the Rapid Mode service through task manager.
Now Im just running tests, and restarting the laptop to install additional Windows updates. Upgrade to Windows 8.1 actually went through this time. After the update, Magician now says that Rapid Mode is on and my SSD again appears to be selectable. Read speeds seems to have gotten a *tiny bit* better but it is still extremely low.
Decided to say screw it, disabled Rapid Mode, restarted, again with the "Start PXE over IPv6/4". Turn off laptop, turn on, surprisingly no BSOD saying my system is forever broken. Now Im trying to see if I could salvage the performance back through messing with the settings so I followed most of the advice on another website.
Now it seems that the write speed is consistently good, but again the read speeds are absolutely horrid. I used AS-SSD for the benchmark instead of CrystalDiskMark this time.
And that is where I am right now. I am very sorry that the post is ridiculously long. I've been constantly looking around the internets to see if anyone has the same problem as me and I couldnt find a solution. I wanted to somewhat be detailed with my process so I can know whether this problem is the software or the MSI hardware. Or if the problem is with my specific SSD and that I'd have to RMA it.

How did you go about installing Windows?
It looks like the first time you used some software that ended up cloning it from the HDD to the SSD. That's a no-no in general, and I'd never trust it to work well.
Then the next time, you say you restored it. But you don't say if that was from the SSD/HDD or from recovery media that you had generated.
I'll be perfectly honest, I'd only trust installing from Recovery media when it comes to installing a new drive.
I'd say to do that. Install from Recovery media and see if that fixes the problem.
I will also say that a number of users have had issues with the Samsung 840 drives. Most of them were using the Samsung 840 Pro drives, not the EVO's, but just something to keep in mind. They were only able to get them to operate at SATA2 speeds.

X220 with Windows 7 (64 bit) Pro using SSD Samsung 840 (500G) drive

I am using a Thinkpad X220 (4291) laptop with 8 gigs of RAM. I recently switched my HDD for an SSD (Samsung 840 which is 500G). I have been following the posts and have set the BIOS accordingly as well as updated firmware for the drive. I use Crystal Disk Mark for measuring the read/write of the drive and am not getting the speeds I should. I currently get:
CrystalDiskMark 3.0.2 (C) 2007-2013 hiyohiyo
                           Crystal Dew World : http://crystalmark.info/
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]
           Sequential Read :    93.514 MB/s
          Sequential Write :    95.135 MB/s
         Random Read 512KB :    89.534 MB/s
        Random Write 512KB :    89.051 MB/s
    Random Read 4KB (QD=1) :    12.735 MB/s [ 3109.1 IOPS]
   Random Write 4KB (QD=1) :    29.898 MB/s [ 7299.3 IOPS]
   Random Read 4KB (QD=32) :    85.220 MB/s [ 20805.6 IOPS]
Random Write 4KB (QD=32) :    54.319 MB/s [ 13261.4 IOPS]
Test : 1000 MB [C: 5.3% (24.6/465.8 GB)] (x5)
Date : 2013/01/14 13:23:26
    OS : Windows 7 Professional SP1 [6.1 Build 7601] (x86)
As you can see the speed is drastically slower than advertised. (Should get 504 Mbits/sec read)
Any thoughts?
Thanks,
Jamie

I have an X220 with W8 Pro and Samsung 840 Pro. Getting 528 read and 474 sequential write.   Did you install the Samsung Magician software and update the firmware on the SSD?
Samsung Magician will also provide a speedtest you can check against crystal disk mark.
Lots of sites for optimizing SSD settings but unless it is a firmware issue I don't know why you would get such slower speeds.
Kent

Samsung 840 EVO SSD slow in macbook Pro

Hello Everybody.
Some months ago I got from amazon the a 250 Gb ssd, samsung 840 Evo.
Usign Black Magic I was impressed to see read/write speed about 450 MB/s.
Lately, running Black Magic Speed test, I noticed that the results drop down to 30 MB/s.
I just updated the ssd firmware and the result are almost the same (i think is going a lil better, but still dropping to 30-40 MB/s.
I know there are some threads about this, but didnt get to have clear is this normal, a faulty piece or what?
Some more info:
Trim Enabler ON.
Free space from 50Gb-120 Gb (the results are almost the same)
Macbook Pro 15" mid 2012, 2,3 GHz ,i7, 8GB ram.
ssd firmware EXT0BB6Q (just updated)
Even more info:
Right now I have just Chrome opened, and I'm running some tests.
The very first result go up to 480 Read and over 500 Write.
Restarting the test sometimes the first results in Write dont go higher than 260 MB/s.
Within 10-15 sec the write speed drops to 180 Write, then up again to 230-260 MB/s.
Waiting 1-2 min It drops down to 100, then 80 to reach 30 MB/s (all this is Write speed, Read is almost constant at 480-500 MB/s)
Stress 5GB.

totemsub wrote:
Grant,
I have been using the drive as a system drive for one year without enabling the TRIM, which I did yesterday. Are you suggesting that enabling TRIM does not remove the garbage filled blocks? Should I format the drive and proceed with a fresh install, or will the blocks clean with regular use?
Put simply, when something is deleted on a HD, the OS understands that the space is now free and can be written to. SSD's do not understand that so the pages from which the file was deleted are considered still full of good stuff. The link I provided goes into some detail about what's involved in erasing SSD blocks so deleted files get moved along with the current files in the SSD erasure dance.
TRIM is the way the OS informs the SSD that the space occupied by the deleted file really can be erased, and the SSD then acts on it. However, your SSD hasn't been directly notified about the year's worth of deleted data because TRIM wasn't activated to do it. The SSD's Garbage Collection process will get to that space eventually but it won't be as efficient as if TRIM was there to help.
But since all the SSD's blocks have a finite life span, the less they're exercised by erasing, formatting and reinstalling stuff, the longer the SSD should last.

MacPro 4,1 won't boot from Samsung 840 EVO SSD

Hello,
I've recently replaced the SSD in my MacPro4,1 system with a Samsung 840 EVO one. Before that I had an older OWC disk that worked fine.
Did a fresh install and everything was fine until the first reboot when the system doesn't start from the SSD anymore. It stays a bit displaying the access denied icon (cycles a couple of times through the mac icon, which dissapears immediately, and the access denied one) and then it boots into Windows or Recovery (both of these are on a separate partition).
Startup manager does not show the SSD in the list. Booting in Windows or Recovery however, the SSD appears in the list of devices that I can boot from. However it does not work.
I managed to start it up by booting into Recovery first, doing a Repair Disk which shows at the end "Updating boot support partitions for the volume as required." and then rebooting. This only works once, if I want to reboot again I have to do the Repair Disk bit again.
Thanks,
Andu

Check to see if you have the latest firmware on the Evo
http://www.samsung.com/global/business/semiconductor/minisite/SSD/global/html/su pport/downloads.html

Crucial M4 128GB VS Samsung 840 120GB - Mid-2012 MacBook Pro

I would like to put an SSD in my Mid-2012 MacBook Pro. As the tradition HDD is a real bottle neck the system. Space is not really an issue, but price is at the moment. It's between these two, Crucial M4 128GB VS Samsung 840 120GB, just to be used for everyday use, thoughts?

I'm a huge Crucial fan - I have a 512GB Crucial m4 SSD series installed right now and am eagerly awaiting the shipment of the Crucial M500 960GB SSD. One thing that I love about Crucial is that you can accomplish firmware updates directly on your Mac - with Samsung, I believe, you have to use a Windows machine.
Crucial SSDs are perfect for Macs - many of us around here have them.
The only problem that I see that you may run into is getting the data from your hard drive (you don't say how much space you're using on it) to a 128GB SSD. If you're under 128GB on your HD then you can just clone your data and OS, etc., onto the new SSD. Or you can make a 'fresh' start and format the drive and install the OS and then begin the laborious task of adding your apps back.
See my one and only user tip - Upgrading your MacBook Pro with a Solid State Drive - for some tips on transferring that data. I've always used Carbon Copy Cloner - but then I've always been moving to a SSD that was comparable in space to my 'old' HD.
Call back with any questions...
Clinton

T440s is killing Samsung 840 pro SSD's

Hi all,
I have a new T440s, bought with HDD. As I wanted to use a reliable SSD, I bought a Samsung 840 pro, which I already have running in another system. This is when the problems started. In a German Forum several users report similar problems, so I just wanted to provide a summary here, so that maybe the international community can help. I consider myself as an experienced user, have built various PC systems over the past years and have currently a desktop system running with Samsung 840 pro. Here are the details:
I have installed Windows 8.1 (various times, first clone from HDD and later after recurring problems, complete clean install from Win 8.1 DVD), Bios set to UEFI only + Intel Rapid Start disabled before installation.
The issue is now that with the SSD I am getting constant HDD errors (visible in EventViewer), so that usually after a few hours of operation the OS gets damaged to the point that it cannot boot any more. I should mention that the same system is running stable with the original HDD. First I thought it is a defective SSD and I got it replaced by Samsung. However, with the replaced new SSD I am facing the same issues. Earlier this year I fixed a problem on a desktop PC with 840 pro where the symptoms looked similar. In case of the desktop system, the issue could be fixed by replacing the SATA cable (which is obviously not an option on the T440s).
And yes, I am using the latest SSD firmware, BIOS update, Lenovo drivers. Now, the issue is that I do not seem to be the only one with these problems. Other users in a German Thinkpad forum report similar problems and not only on Windows systems but also on Linux installations (one even got the mainboard replaced by Lenovo and it still did not solve the problem).
I contacted Lenovo support and they replied that they are only supporting original Lenovo SSD's. I must say that I am really disapointed that my brand new system from a renowned manufacturer consistently does not work with one of the most widely used SSD's. Currently, some users in the German forum report that they are having more luck with Samsung EVO SSDs. However, after this experience, I really lost confidence in the T440s. If the design should have problems with Sata 3, I don't know if I can trust this notebook in a business environment.
Any comments/suggestions highly welcome.
Regards,
Frank
PS: Here is a reference (of at least two other users reporting this issue in this forum here, in German though)
http://forums.lenovo.com/t5/T4-T5-und-neuere-T-Serie/Lenovo-T440s-Samsung-840-pro/m-p/1297091#M1562
Solved!
Go to Solution.

First of all (In the US at least), there are up to 5 different OEM SSD drives to choose from (depending on what base model is selected), with what in addition looks like 3 different variations (regular?, OPAL and edrive).
Hard drive
128 GB Solid State Drive, Serial ATA3[subtract $150.00]
180GB Solid State Drive, Serial ATA3 Opal[subtract $50.00]
256 GB Solid State Drive, Serial ATA3 eDrive Capable
240GB Solid State Drive, Serial ATA3 Opal[add $50.00]
512GB Solid State Drive SATA3[add $250.00]
When I was researching SSD drives for the T440s a month ago, I came across the following, although I do not know the accuracy of the information:
Does anyone know the difference between these two drive options:
256 GB Solid State Drive, Serial ATA3 eDrive Capable
240GB Solid State Drive, Serial ATA3 Opal [add $50.00]
The 240GB is an Intel Pro 1500 and the 256GB are either Liteon (Plextor) M6S or Samsung PM841 TLC Drives (OEM 840s).

Has anyone installed the samsung 840 pro in MBP mid 2009?

Hi All,
My macbook doesnt work anymore because the HDD gave up. I now ordered the samsung 840 pro ssd. My mbp doesn't start up anymore and all I can see is the file boz and a ? mark. I have the CD that came with the macbook. Is it hard to install the software or should I just take it to apple and let them do the job?
Also, I only bought the 128 GB since I cannot afford the 256g. I have a seagate 1 TB external hardrive. Can anyone please tell me what to do to set all downloads and other documents to save in the external so I am not using all the 128 g

JS28,
I installed a Samsung 840 PRO SSD in my Mid 2010 MacBook Pro. It’s not hard to install the software onto your SSD, though it will take some time to do so. I don’t know how much Apple would charge for that service, so the time vs. money tradeoff is something that you’ll need to decide.
If you decide to do it yourself, what you’ll need to do is to boot your MacBook Pro from the grey installation DVD marked “Mac OS X Install DVD” that originally came in the box with your MacBook Pro; to do that, hold down the C key as you power up. Once you’ve booted up from the DVD, you’ll need to run Disk Utility to format your SSD as “Mac OS Extended (Journaled)”. Once it’s been formatted, you can then install the version of Mac OS X that is on that DVD, either Leopard or Snow Leopard. Once your MacBook Pro’s original version of Mac OS X is installed on the SSD, you can then reboot from the SSD, and optionally install the iLife applications from the “Applications Install DVD” — the other grey installation DVD that came with your MacBook Pro.
Next, you’ll need to upgrade or update your OS to Mac OS X 10.6.8, which in turn will allow you to access the App Store, so that you can redownload Mountain Lion for installation. Once you’ve installed Mountain Lion on your SSD, it will then have the Mountain Lion recovery partition installed also.
To ensure that your downloads and documents are saved to your external Seagate HDD, be sure to choose a location on that drive whenever you download a file or save a document. Each application that you use will probably need to be set to download/save to your external HDD, but each of them should remember that external HDD location for future downloads/saves.

Can I install a Samsung 840 Pro 256GB into the new iMac late 2013?

Hi There,
1)   Can a Samsung 840 Pro 256GB SSD be installed in the new iMac late 2013 model? (My plan is to remove the existing 1TB HDD and replace with the Samsung SSD)
1.1) I have heard somewhere, even though it will fit, Apple's logic board firmware will pick up the non-apple product and render the iMac useless until original hard drive is reinstalled.
1.2) If it will work, will I loose my warranty on iMac? Note, the SSD will be installed by an Apple authorized workshop.
2)     Can 2x 2.5 sata drives be installed in the iMac?
2.1) I know the iMac only has 1x SATA and 1x PCIe slot, but can one not install a PCIe - SATA converter and also a 2x 2.5 drive bay in the place of the existing         3.5" drive?
Thanks for your assistance.
Regards,
asdutoit

I checked on the Samsung website and the 840 Pro is OSX compatible and should work in your MBP.
http://www.samsung.com/us/computer/memory-storage/MZ-7PD256BW-specs
Ciao.

Samsung 840 Evo incredibly slow in MacBook Pro 2011

I just got a brand new 250GB Samsung 840 Evo SSD and put it in my MacBook Pro. The drive is incredibly slow. OS X install took hours, and it takes over a minute to boot up. Even small tasks like clicking a button take several seconds to process. I have enabled TRIM through terminal (which took about an hour) and still no better. Is this something that can be fix or should I get an RMA# from NewEgg?

jeffturner24,
older firmware revisions of the 840 EVO are known to be problematic on Macs. You can download the latest firmware package for it (and an instructional PDF) from this Samsung page; with this package, you can burn a bootable DVD from which the latest firmware revision can be installed.
Another possibility is that you might have a faulty internal SATA cable. If you connect your SSD externally and boot from it then, and it runs at normal SSD speeds, but it remains incredibly slow when booting from it internally, that could point to a problem with your internal SATA cable. (Hard disks are more tolerant of a faulty internal SATA cable than SSDs are.)
If neither step above resolves the issue, then you should arrange an exchange with Newegg.

T420 won't boot with new Samsung 840 Pro SSD

Hi all
I seem to have a failed brand new SSD. Before I RMA it, please help me spot my stupid mistake
I've just used Samsung data migration to copy my C drive to a Samsung 840 Pro 128GB SSD as usual.
I went into device driver, and set the SSD to cache writes, so the SSD was working then.
I removed the 320GB SSD, installed the SSD and rebooted.
After the BIOS flash screen, the system halts with a funny symbol on the screen and a flashing cursor.
It responds to Ctrl Alt Del. but doesn't get as far as testing the DVD drive.
After replacing the SSD with the HDD and rebooting, all is fine again ...
The BIOS shows AHCI mode, and the SSD and contents (in a USB3 drive caddy) are visible and readable.
I can't use Samsung SSD magician because it won't see the SSD over USB (clever!), so can't work out how to upgrade firmware.
This is an i5, 8GB, 320GB machine with 1600x900 screen, with XP Pro 64-bit.
What gives?? Others here have posted with working 840 Pros in a T420, so I think it's compatible.
Could this be a SATA2/SATA3 thing or AHCI? I can't see any SATA2/3 control in the BIOS - does it just auto-negotiate?
Most grateful for any suggestions and thanks in advance
Solved!
Go to Solution.

Hi woothoot,
I'm not familiar with the Samsung data migration tool. Is it actually cloning the drive, or just copying files and settings?
With ThinkPads, it is usually recommended to have the target drive installed in the laptop and the source on the external connection. Doing it the other way sometimes results in a non-booting drive.
Can you rearrange things so that you do the clone op with the SSD installed in the T420?
Z.
The large print: please read the Community Participation Rules before posting. Include as much information as possible: model, machine type, operating system, and a descriptive subject line. Do not include personal information: serial number, telephone number, email address, etc. The fine print: I do not work for, nor do I speak for Lenovo. Unsolicited private messages will be ignored. ... GeezBlog
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Updating samsung 840 firmware

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