DICOM CD read as blank disk by lion but correctly read by Snow Leopard

I stuck a DICOM CD into my iMac hoping to read it with Osirix.
It was read by Lion as a blank CD.
However, it was correctly read by Snow Leopard.
? disk not finalized.
I am surprised at the discrepancy.
Pls look into this.
Thanks.

I have found the solution to the problem in the following post by BeanCurdNerd
https://discussions.apple.com/thread/3413998?start=0&tstart=0
The DVD was cut in UDF format.
Default 64 bit Lion does not support UDF.
The solution was in the following post:
I shutdown Lion.
I pressed the numbers "3" and "2" on the keyboard and the pressed the Power On button to turn on the Mac.
I kept "32" pressed during start up.
Lion restarted in 32-bit mode.
Then my DVD was successfully read by OSX and Osirix successfully copied the patient's scan.
Thanks to rikkyfrombristol for discovering this workaround !
Saved me alot of heart-ache !!

Similar Messages

Installed Lion but I want run Snow Leopard as well

I have installed Lion but I am having some issues with some apps. I thought that I could install Snow Leopard as a virtual machine so I could use those apps in SL, and still keep Lion.
Is that possible? Should I buy Snow Leopard or can I install this virtual machine using the DVD that I got when I bought my Mac?

Barry Fass-Holmes wrote:
Could you please provide evidence which supports your claim that it's "a myth?"
Not really. I also cannot provide evidence that the legends of King Arthur, or Atlantis, or Bigfoot are myths. The lack of evidence that they are true is enough to place them in the category of myth. The inability to prove them false does not make them true. The same holds for the myth that "Snow Leopard is not licensed to be run in a virtual machine on a host Mac running Lion." That can be disproved simply by reading the Snow Leopard SLA, in which no such prohibition exists.
I would be very interested in seeing where Apple's EULA for Snow Leopard, Lion, and/or Mountain Lion provides permission for users to install Snow Leopard in a virtual machine.
It isn't there. The idea that "it must be prohibited because the license does not specifically allow it" is absurd. If that method of interpreting licenses were correct, I could claim that running OS X while drinking coffee, or while wearing a three piece suit, or on a Mac in which the Apple logo has been covered over with a Detroit Tigers logo, are all prohibited, because the SLA doesn't explicitly permit them. Those are all absurd, of course; it is not a violation of the SLA to do any of those things. So it is with running Snow Leopard in a virtual machine. The license says that it must be a single copy only, running on Apple hardware. Running Snow Leopard in a virtual machine on a Mac with Lion as the host OS complies with the "one copy on Apple hardware" terms.
Lion's and Mountain Lion's EULAs do provide permission to install Lion or Mountain Lion (respectively) in a VM, but my reading of the EULAs is that Apple does not permit installation of Snow Leopard in a VM.
The 10.7 and 10.8 SLAs permit users to run up to three copies of the software simultaneously, one "directly" and up to two more in "virtual operating system environments". The 10.6 and earlier SLAs say one copy only, with no restriction on whether it is directly or in a virtual operating system environment. The term "directly" was added in the 10.7 and 10.8 licenses; it was not there in 10.6 and earlier. One copy of 10.6 running on Apple hardware is one copy of 10.6 running on Apple hardware, whether in a virtual machine or not.
Nowhere in the 10.6 SLA does it say that installing Snow Leopard in a VM is prohibited. Someone started that rumour and it has become one of the most pervasive bits of computer folklore in history. It is a myth.
I would be more than happy for you to demonstrate that I am incorrect.
I hope I have been helpful; let me know if there is any other information you need.

Installed Lion but MacBk restart in Snow Leopard

I bought a copy of Lion on my iMac and it installed fine. I went and logged onto my kids' laptops (both MacBooks) and installed Lion for them using my App store account. Everything went well. However, after they rebooted their computer, the computer came back up in Snow Leopard. I went to App Store and tried to press "INSTALL" but it won't do a thing. Can anyone help pls? Thx.
- Ella

I bought a copy of Lion on my iMac and it installed fine. I went and logged onto my kids' laptops (both MacBooks) and installed Lion for them using my App store account. Everything went well. However, after they rebooted their computer, the computer came back up in Snow Leopard. I went to App Store and tried to press "INSTALL" but it won't do a thing. Can anyone help pls? Thx.
- Ella

Wifi 5ghz and NAS using AFP not working in lion but no problem in snow leopard.

After I upgrade to lion the first thing I discover is my wifi fail to connect to the N 5ghz from my time capsule. It use to be no issue when I'm on snow leopard. Even my iPad connect 5ghz with no problem.
The next problem I found is, I can't connect to my NAS even I using AFN. Same no issue in snow leopard.
Wonder is it due to upgrade rather then fresh installation? Will do a fresh installation in my another Mac this weekend and see if facing the same problem or not.

I know this is an old thread but the problem is 802.11d which disables certain channels based on the first beacon the Wi-Fi sees when you wake up your Mac.
You need to set the 5GHz channel on your Time Capsule to a channel that is supported in all domains like 36 or 40. More info here: http://jeff-with-a-g.blogspot.com.au/2012/04/5ghz-wifi-on-your-mac-got-you-down. html

Stuck in Lion installation *LIMBO* - disk damaged, disk wont repair, disk is locked, wont revert back to snow leopard

I'm stuck in Limbo. I cant complete the install and cant revert back to snow leopard. All I have are the installer utilites (including safari).
I'm running a summer 2009 release macbook pro 17 inch. I downloaded the Lion install app and proceeded to follow the instructions and guided. After less than a minute the install stopped to say that it could not be completed because the hard disk is damaged and can’t be repaired.
So...I went to disc utility to verify the disk and this is what I got.
Verifying volume “Macintosh HD”
Checking file systemPerforming live verification.
Checking Journaled HFS Plus volume.
Checking extents overflow file.
Checking catalog file.
Incorrect number of file hard links
Bad hard link creation date
(It should be 3325742596 instead of 3340504404)
Hard link record has data extents (id = 2888169)
Checking multi-linked files.
The volume Macintosh HD could not be verified completely.
Error: This disk needs to be repaired. Click Repair Disk.
So I put in my Snow Leopard disk and went to repair disk. Now, THIS is what I got.
Disk Utility can’t repair this disk. Back up as many of your files as possible, reformat the disk, and restore your backed-up files.
So then I wanted to go back to Snow Leopard at least, but I cant. When I go to “Startup Disk” and select my Mac 10.6.8 drive, it says:
You can’t change the startup disk from the selected disk.
Startup Disk could not gather enough information on Selected Disk.
So that’s annoying because it keeps me stuck in that installation "limbo" - not able to finish installing and not able to go back.
I restarted, holding down the OPTION key, but it only gave me one boot selection - the installer itself.
So then I try yet again to install this thing because there’s not much else I can do...but now it won’t even start installing...when the installer screen asks which drive I want to install it on, for which I would of course choose my Macintosh HD, it says in subscript underneath Macintosh HD:
“This disk is locked” and it wont let me select the “continue” button to begin the installation.
Please help, someone.

phew, just got everything back to "normal"
I turned off my mac for about 10 minutes and then started it up again. Also I think this time i inserted my snow leopard disc at just the right time, not too early not too late.
Whatever it was, when i went to "Startup Disk" the snow leopard disc showed up!
So then I went to disk utility after booting the snow leopard installer for the first time. It said it repaired one thing but then stopped and said it couldnt repair it and told me to back up and reformat.
Then I just ran a simple verify again and it said the HD was "OK" - it gave me a clean bill of health?!?!
So then I went to startup disk again, and was finally able to get out of limbo and back to good old snow leopard.
Now I'll install Lion, but taking all cautions beforehand...maybe i'll wait a few days first though.
Thanks to everyone.

If I upgrade to LION on line, how do I resolve startup problems by using a disk to startup as I did with Snow Leopard?

I have 10.6.8 and am about to download LION.

Just to let you know
1: Lion needs 2GB, but prefers 4GB of RAM
2: Requires a Intel Core 2 Duo or more recent Intel processor
3: No Rosetta, a lot of your 10.5 / 10.6 programs and drivers may not work
4: Your older older machine may not have the ability for trackpad gestures etc.
5: If your machine isn't a Early 2011 Mac or later, your results with Lion may vary, you might have a lot of issues others report on these forums with older hardware.
6: You can't use TimeMachine to restore to Snow Leopard once it's been hooked to Lion, only by making a Snow Leopard clone on a external drive. You'll need to COMPLETELY erase the Lion drive hold c booted from the 10.6 disks before restoring a Snow Leopard TM or clone, this is to erase the hidden Lion Recovery partition installed on the drive.
7: You should update all your third party software for Lion, especially any that install Kext files, or remove these third party software and their kext files from your System/Library/Extensions folder while your still in Snow Leopard.
This Terminal command will list the non-Apple kext files (doesn't work while booted into Safe mode, aka hold shift key boot)
kextstat -kl | awk ' !/apple/ { print $6 } '
copy and paste the above command, do not type it, and press return to list.
8: If you have a issue and Lion is stuck on a spinning grey screen wheel, reboot holding the shift key, this will disable the QuartzExtreme and third party kext files.
9: Lion is slower than Snow Leopard, for maximum performance on Lion, backup files, erase and fresh install 10.6 then upgrade to 10.6.8 then to Lion and update, then install Lion ONLY programs from fresh sources and finally files from backup.
10: Maintain two separate hardware copies of your data in easy to access ability (not all TimeMachine) in case you need to rebuild the operating system from scratch or if your TM drive is borked and you don't know it yet.
https://discussions.apple.com/message/16276201#16276201
11: Lion changes a lot of things, your going to lose Front Row, Spaces, Exposé, the scrolling direction is backwards and more restrictions and noob proofing. It might make you angry, it might not work, however if you clone or keep your TM drive disconnected, you can recover to Snow Leopard without much fuss and leave Lion for a new machine as Lion begins a whole new level of bloating to retire older hardware prematurely, likely for quads cores and up.
Good Luck

Is there anyway I can get rid of Lion and get back to Snow Leopard?

Is there anyway I can get rid of Lion and get back to Snow Leopard?

Back to Snow Leopard from Lion install method
Read and print out these instructions, your computer is going to be offline and you wil be cutoff from help until your machine is restored.
Clear the Desktop, Downloads and Trash of anything you wish to keep by placing their files in the respective Documents, Music, Pictures, Movie folders.
Disconnect other drives except the sole backup drive.
Backup ALL your Users folders (Documents, Pictures, Movies, Music etc) manually (drag and drop methods) to a (not TimeMachine) external powered drive (HFS+ journaled formatted in Disk Utility) and disconnect, your going to be wiping the entire boot disk of ALL DATA.
(warning, everything will be gone and not recovered, OS, programs, files, Windows etc all gone.)
Note: You might want to hold c and boot off the 10.6 installer disk and use Disk Utility to format the new blank external drive instead of using OS X Lion if that's hosed. Then reboot into Lion and copy files, may be safer that way.
Here we go!
Hold c and boot off the 10.6 installer disk that comes with your computer and second screen in just STOP there, don't install OS X yet.
Look at the Utilities Menu for Disk Utility.
On the left is the name of your hard drive maker, click it and Erase (format HFS+ Journaled), give it the same drive name as before, and click Erase...
(note: if you want to "scrub" the drive of old files that haven't been overwritten yet, then use the Security Option > Zero Erase, takes a lot longer)
This should wipe the drive of ALL partitions (GUID, OS X and 10.7 Recovery, Windows if present)
When it's done, quit and install OS X 10.6. Then install all your programs from fresh sources and validate/update.
When you setup a first account, use the same user name as before, this way you can simply drag and drop the content of your previous Users folders from the external drive right back into the new Users folders and everything should work peachy. Links in iTunes to music, playlists and iPhoto links especially.
Update OS X to 10.6.8 using the Combo Update for best results.
http://support.apple.com/kb/DL1399
(Note: If your original machine had 10.5 and you want the free iLife that comes with the disks with the computer, then you'll have to install 10.5 first using the same c boot/erase/format methods as above, then update to 10.6 via the disk, then Combo Update 10.6.8)
Final step optional but highly recommended.
A lot of people use a Carbon Copy Clone of their boot drive to a new HFS+Journaled external drive (used only for this purpose) as a "hold the option key" bootable backup in case something goes wrong with their boot drive or need to restore to a previous OS X version.. (in addition to TimeMachine drive for more immediate backups.)
It's not advised to have a Bootable Clone and a TimeMachine partition on the same external drive, as two drives gives hardware protection in case one fails.

Battery discharge: Lion 10.7.2 vs Snow Leopard 10.6.8

Has anyone noticed that Lion consumes more resources than Snow Leopard thus causing faster battery discharge?
YMMV, but it would be interesting to see of others can get similar results. Do you suppose Lion 7.3 will increase or decrease resource usage and what affect will it have on battery life?
I called Apple about the battery discharge issue on my 2 week old MacBook Pro with Lion 7.2. I was only getting about 1/2 of the 7.7 WIFI hours advertised. They gave me the usual "if depends" on WIFI, system settings, applications, etc., i.e. such things as cpu and memory load (paging/swapping=>disk i/o), other disk activity, and a few other things.
My large expenditure on the new MacBook spurred me to investigate what was going on using the Activity monitor. I configured my old MacBook Pro (mid 2009) and my new MacBook Pro (late 2011) with the same system preferences. I reset both the PRAM and SMC on both machines to maximize the battery charge (documented elsewhere).
Obviously, a direct hardware comparison would not be meaningful but when you look at the operating systems there is a significant difference between Snow Leopard OS X 10.6.8 and Lion OS X 10.7.2. Lion uses much more resources than Snow Leopard.
My Observations:
The first value I list is for OS X 10.6.8 and the second for OS X 10.7.2. I tried numerous other combinations but these nicely summarizes my results.
1) I started with only the Activity monitor, iTunes Helper, and Epson EEventmanager manager running, No WIFI or any other user processes
CPU % idle               : 98.75 vs 99.4 (i.e. both machines were literally idle)
No. of threads           : 179   vs 277 --> + 55%
Kernel threads           : 60    vs 82   --> +37%
Processes                : 41    vs 54   --> +32%
Wired Memory MB          : 480   vs 864 --> +80%
Active Memory MB         : 198   vs 407 --> +106%
Memory Used GB          : 0.808 vs 1.32 --> +63%
Percentage of 4 GB       : 20%   vs 33% --> +65%
Virtual Machine size GB : 96    vs 149 --> +55%
2) With WIFI and Safari added
CPU % usage              : 72.9 vs 91.02 (i.e. both machines were not very busy)
No. of threads           : 253 vs 376 --> +49%
Kernel threads           : 60   vs 82 --> +37%
Processes                : 51   vs 63 --> +24%
Wired Memory MB          : 669 vs 1007 --> +51%
Active Memory MB         : 600 vs 1190 --> +98%
Memory Used GB          : 1.57 vs 2.47 --> +57%
Percentage of 4 GB       : 39% vs 62% --> +59%
Virtual Machine size GB : 131 vs 191 --> +46%
Look especially at the percentage of memory used. In either case, I measured no paging nor swapping. But, as you can see, with the increase of memory used with Lion when WIFI and Safari were added you could quickly push the memory as more process are added and start paging and swapping to/from disk hence use more battery charge.
The increase in number of threads, processes, memory usage, virtual machine size, and WIFI activity would imply that Lion would have to consume more battery charge than Snow Leopard as you use more cpu/memory to chase more threads.
I looked at WIFI usage and it involves a lot of chatter between the computer and the internet. Over time a lot of packets are sent/received even when no data is being passed and would be a drain on the battery. There would be a greater drain when there is data passed because of the additional CPU and memory needed. But, in todays world, you cannot run without an ethernet or WIFI connection because of the dependency on the information/data on internet cloud.
Hardware:
MacBook Pro 13", mid 2009, OS X 10.6.8, 2.5 GHz Intel Core 2 Duo, 4GB 1067 MHz DDR3, 5400 rpm Hard Drive
MacBook Pro 15", late 2011,OS X 10.7.2, 2.4 GHZ Inter Core i7, 8 GB 1333 MHz DDR3, 7500 rpm Hard Drive

There is a Installer update. http://support.apple.com/kb/DL1512
You could try that.

I had Leopard on may Mac. I upgraded to Mountain Lion using Snow Leopard. I can't use my video with Mountain Lion. Can I load Snow Leopard on an external hard drive so I can use it with my camera?

I had Leopard on may Mac. I upgraded to Mountain Lion using Snow Leopard. I can't use my video with Mountain Lion. Can I load Snow Leopard on an external hard drive so I can use it with my camera?

First, you cannot do this if you have a Boot Camp partition.
Second: Create a new partition.
1. Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
After the main menu appears select Disk Utility and click on the Continue button. Select the hard drive's main entry then click on the Partition tab in the DU main window.
2. You should see the graphical sizing window showing the existing partitions. A portion may appear as a blue rectangle representing the used space on a partition.
3. In the lower right corner of the sizing rectangle for each partition is a resizing gadget. Select it with the mouse and move the bottom of the rectangle upwards until you have reduced the existing partition enough to create the desired new volume's size. The space below the resized partition will appear gray. Click on the Apply button and wait until the process has completed. (Note: You can only make a partition smaller in order to create new free space.)
4. Click on the [+] button below the sizing window to add a new partition in the gray space you freed up. Give the new volume a name, if you wish, then click on the Apply button. Wait until the process has completed.
You should now have a new volume on the drive.
It would be wise to have a backup of your current system as resizing is not necessarily free of risk for data loss. Your drive must have sufficient contiguous free space for this process to work.
Third: Install Snow Leopard.
Boot from your Snow Leopard DVD. Follow instructions for installation being sure that before you actually install Snow Leopard you have selected the new partition as your target destination.
Booting From An OS X Installer Disc
1. Insert OS X Installer Disc into the optical drive.
2. Restart the computer.
3. Immediately after the chime press and hold down the "C" key.
4. Release the key when the spinning gear below the dark gray Apple logo
appears.
5. Wait for installer to finish loading.

Downgrading from Lion 10.7.5 to Snow Leopard 10.6 w/o Time Machine

I've been trying to solve this issue for a bit, and would appreciate any fresh perspectives on the issue.
I recently purchased a 2006 Mac Pro 1.1. It has a dual 2.66Ghz Xeon processor. I'm fairly sure nothing has been customized in the machine hardware-wise, and that it is in the original configuration apple sold it with in 2006.
The machine arrived with the Lion 10.7.5 OS on it, which was incompatible with some of the software plug-ins I use for editing audio, so I decided to re-install Snow Leopard 10.6. I inserted my install DVD like I would normally, and was greeted with the error message "OSX cannot be installed on this computer, please use version 23.1.1".
I checked out the forums, and seeing that this was a common problem (with what seemed like an easy fix), proceeded to try and install anyway. I booted from the DVD by holding "C" on start-up. After booting and asking what i wanted to use as my language, the error message "Mac OSX cannot be installed on this computer" was displayed. Thinking this was another glitch, I clicked "restore from back-up, then managed to use Disk Utility to wipe my HD and zero out the contents. I reformatted my HD to Mac OS Extended Journaled, Re-partitioned it, and then reset my NV or Pram (Command+option+P+R) until i heard the start-up noise twice.
Next, I restarted the computer, booted it from the disk again, and crossed my fingers it would let me install. No luck.
I don't have a second mac pro to clone, or a Time Machine back-up from this machine (as it is brand new to me). Furthermore, it's previous owner left me with no restore disks, or usb sticks to even put Lion back on (which i don't want to do anyway, but would at least make the machine functional until i can correctly install 10.6SL).
I do have a spare 2009 imac to work with in the meantime, with Snow Leopard, though I'm assuming attempting to clone that drive would screw with the drivers and firmware in the Mac Pro. Are there any tricks to re-install my OS without using a Time Machine back-up or clone? I have the DVD, my machine just doesn't seem to want to install from it. The nearest repair shop is several hours away.
I'm at a loss for what to try next. Any ideas?

The following will only work on a Mac that is capable of being booted by a retail Snow Leopard DVD. Fortunately, you can do the following on your model should you prefer. As an alternative you could simply create a second partition on the hard drive and install a fresh copy of Snow Leopard without having to erase the drive.
Downgrade Lion/Mountain Lion to Snow Leopard
1. Boot from your Snow Leopard Installer Disc. After the installer
      loads select your language and click on the Continue
      button. When the menu bar appears select Disk Utility from the
      Utilities menu.
2. After DU loads select your hard drive (this is the entry with the
      mfgr.'s ID and size) from the left side list. Note the SMART status
      of the drive in DU's status area. If it does not say "Verified" then
      the drive is failing or has failed and will need replacing. SMART
      info will not be reported on external drives. Otherwise, click on
      the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions
      from the drop down menu to one. Set the format type to Mac OS
      Extended (Journaled.) Click on the Options button, set the
      partition scheme to GUID then click on the OK button. Click on
      the Partition button and wait until the process has completed.
4. Quit DU and return to the installer. Install Snow Leopard.
This will erase the whole drive so be sure to backup your files if you don't have a backup already. If you have performed a TM backup using Lion be aware that you cannot restore from that backup in Snow Leopard (see below.) I suggest you make a separate backup using Carbon Copy Cloner.
If you have Snow Leopard Time Machine backups, do a full system restore per #14 in Time Machine - Frequently Asked Questions. If you have subsequent backups from Lion, you can restore newer items selectively, via the "Star Wars" display, per #15 there, but be careful; some Snow Leopard apps may not work with the Lion/Mountain Lion files.

How can I unistall Lion and go back to Snow Leopard?

I upgraded to Lion (stupidly and blindly) and now most of my programs are not compatible. What is the process to go back to Snow Leopard?

Given the lack of response to this particular discussion, and given all the various and sundry ideas on this topic, I have had a panic-stricken 48 or so hours since I asked my question. Here's what finally worked to get me back to normal:
1. First, I gritted my teeth and erased my hard drive, hoping and praying I'd be able to restore from Time Machine. I'd been backing up for quite some time, but never needed it before. HOWEVER:
Lion evidently left little gremlins all over my hard drive, because I simply could not get my hard drive restored properly, not from the Time Machine restore function on the SL disk NOR from a manual "Star Wars" pick and choose with my Time Machine. Therefore (and this is important):
I zeroed out my hard drive completely, after trying for an entire day to get things back to normal. What you have to do is start up from the Snow Leopard disk, and do a COMPLETE erase, by which I mean that when you use DU to erase your hard drive, you go into the "security" panel on th DU screen and do a 7-pass zero-initialization of your hard drive, i.e., write zeros all over everything on your hard drive seven times, leaving it truly free of that yucky Lion. THEN I reinstalled Snow Leopard, ran Software Update several times until it had updated everything it wanted to ad nauseum, and THEN was able to get Time Machine to work properly and bit by bit restored everything I wanted to restore. I am appalled at the lack of accurate documentation that comes with Time Machine, frankly. Anyway, when you get ready to restore your software AFTER you put the Snow Leopard system back on your hard drive and update it, you have to go back to a backup from BEFORE you installed Lion, though: this is important. Don't try to put anything associated with Lion back on your hard drive. For me, that backup was done was last Friday. It took ages, but....my hard drive is now purring like a kitten, and I have Snow Leopard and all my old software back. It was a mess, but it seems to be over. I learned from this disaster how important it is to completely wipe your hard drive clean before trying to reinstall an older operating system. As far as Lion goes, I will be extremely careful before I assume any new upgrade is a good upgrade. It isn't. I LIKE my elderly Adobe programs and my kid likes her games that need Rosetta, as does Word 2004. My Mac is much happier with Snow Leopard. For now. If it ain't broke, don't fix it.

How do I remove Lion and go back to Snow Leopard OS?

How do I remove Lion and go back to Snow Leopard?

If you have the white upgrade disk (originally, you had Leopard and bought SL later), easy. I'm not sure if you have the grey disks (you bought the machine with SL).
If you have the white disk, the first thing you do is get a USB external HD. Format it to GUID with disk utility.
Insert the white SL disk and restart. Follow the instructions to install SL on the external disk.
Have a look here for a step by step tutorial for setting up the external HD: http://www.maciverse.com/installing-snow-leopard-onto-an-external-hard-drive.htm l
From here on in you have two choices:
1. You can run SL off the external disk and keep Lion and all your files/data on the internal disk.
This is the easiset thing to do. You can open files from your Internal Lion disk by navigating through to it in Finder when you're booted in to SL on your external disk. Practical if you have a desktop machine, maybe not if you have a laptop that you need to carry everywhere (you'd have carry the external HD with you all the time).
Any non-Lion only (i.e., not Safari, Preview, Terminal and Mail Lion upgrades) apps should also run off your Lion disk when you're booted into SL, but if you have any problems, just drag them from the Lion Apps folder to the SL apps folder.
2. Move everything over to the external disk if you plan to install SL back to your internal disk.
Start copying over all your apps and files manually by dragging them from the internal disk Apps and Folders to the external disk Apps and Folders. If you have Time Machine, you can also copy your files by navigating to Time Machine through the Finder rather than trying to use the Time machine interface.
You might spend some days doing this, but it's worth doing it manually. When you're done and sure you have everything, google 'Carbon Copy Cloner'. Download it (its free), and clone your external HD to your internal HD. SL restored!

IPhoto says it won't import photos from my Fujifilm Finepix S1000 camera because it's the wrong format (jpeg). It always has before... but I upgraded to Lion then went back to Snow Leopard and now it's not working. Suggestions? Thanks!

iPhoto says it won't import photos from my Fujifilm Finepix S1000 camera because it's the wrong format (jpeg). It always has before... but I upgraded to Lion then went back to Snow Leopard and now it's not working. Suggestions? Thanks!

As a Test:
Hold down the option (or alt) key and launch iPhoto. From the resulting menu select 'Create Library'
Import a few pics into this new, blank library. Is the Problem repeated there?

I recently updated? to Lion from 10.6.8(snow leopard), and things seem to be running slower. Has anyone had similar problems? I have Feb 2011 Macbook pro 13" 2.3 Ghz.

I recently updated? to Lion from 10.6.8(snow leopard), and things seem to be running slower. Has anyone had similar problems? I have Feb 2011 Macbook pro 13" 2.3 Ghz.

As Shootist pointed out, the system uses more power.
However, initially it will reindex the hard drive for spotlight, which will slow things down temporarily.
It also must rebuild caches that eventually will speed things up.
If it has completed indexing the hard drive (no dot pulsing in the spyglass), then there might be something wrong.
Start by booting into the Recovery HD (a partition created with Lion that has Disk Utility and reinstallation options) by holding down cmd-r when you restart. You can let go when the gray screen appears.
When it boots, select Disk Utility and Repair the drive.
If that doesn't speed things up, try re-installing the OS from the same Recovery HD. It won't delete any of your files, but it has helped some people whose Macs ran slow after installing Lion.
Also, how much memory do you have? Lion needs RAM so maxing your Mac out might also help.

If I purchase a brand new I-mac today do I have to run OS Lion or can I load Snow leopard?

If I purchase a brand new I-mac today do I have to run OS Lion or can I load Snow leopard?

Just faced that question, and the answer should be that you can run SL on the latest iMac.
(Our scenario: Bought 3 iMacs in August. Was surprised -- and relieved! -- to see that they arrived with SL installed on them, and grey system restore disks. One of the machines was DOA. Futzed around with it for 6 weeks trying to get it to work, decided it was dead, drove it 4 hours to the nearest Apple Store. They gave us a new iMac, which when we got it back, turned out to have Lion on it. Popped in one of the three grey restore disks that had come in August, installed SL, it works without any problems.)

DICOM CD read as blank disk by lion but correctly read by Snow Leopard

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