"Erase Free Space" work-around for non-apple ssd

for those of you attempting to "Erase Free Space" per knowledge base article:
"OS X Lion v10.7.3: User account passwords appear in log files for Legacy FileVault, and/or network home directories"
quote:
"6. Open Disk Utility.
7. Select your OS X Lion volume on the left.
8. Click "Erase Free Space…".
9. Select the Erase Free Space Option you want and click "Erase Free Space". Enter admin name and password if prompted."
but instead seeing a grayed out "Erase Free Space" in Disk Utility?
you can perform an "Erase Free Space" by using WipeFS app by Jonathan Clark which can successfully perform a DoD (Department of Defense) wipe for digital media, apple's Disk Utility doesn't do this anymore with non-apple solid state drives (ssd)
references:
https://support.apple.com/kb/TS4272
http://itunes.apple.com/hr/app/wipefs/id484887048?mt=12

...but instead seeing a grayed out "Erase Free Space" in Disk Utility?
See,
Mac OS X: About Disk Utility's erase free space feature
which says,
Note: With OS X Lion and an SSD drive, Secure Erase and Erasing Free Space are not available in Disk Utility. These options are not needed for an SSD drive because a standard erase makes it difficult to recover data from an SSD. For more security, consider turning on FileVault 2 encryption when you start using the SSD drive.
Also google "erasing space on ssd".
Bottom line, it is not something you want to do to a ssd.

Similar Messages

Erase free-space and permissions for applications

Hi all. A couple of quick questions...
1) The disk utility has an "erase free-space option". Is there a corresponding Unix command for this function?
2) What are the proper permissions and ownership for files in the Applications folder? In particular, should these belong to "root"? Is that safe?
Thanks in advance
Eric

MacintoshHD:~$ ls -ld / /usr/sbin/diskutil
drwxrwxr-t 32 root admin 1190 Nov 27 05:30:28 2006 /
-r-xr-xr-x 1 root wheel 85580 Sep 8 18:47:38 2006 /usr/sbin/diskutil
so from an admin-privileged account, you shouldn't even need sudo...
Negatory, my UNIXish friend. As I said before, free space doesn't belong to any directory. / is a directory, hence you cannot access free sectors through it. You must access the raw disk device; directories are a logical construct superimposed on the raw disk device by the OS*.
You can find the raw disk device using either Terminal or Disk Utility. In Terminal, you can use
df /; in Disk Utility, select 'Macintosh HD' in the left panel, and click "Info" in the tool bar. On my system, / is "mounted" on /dev/disk0s03; that's the raw disk device which holds all the disk sectors, whether they are in use or not.Karl-Zimmermans-Computer% df /
Filesystem 512-blocks Used Avail Capacity Mounted on
/dev/disk0s3 116948016 87894784 28541232 75% /
Karl-Zimmermans-Computer% ls -l /dev/disk0s3
brw-r----- 1 root operator 14, 2 28 Nov 23:11 /dev/disk0s3
Karl-Zimmermans-Computer%As you can see, you must be root to write to this device. Hence, you do need to use sudo to erase the free space.
*The "raw disk device" is also a logical construct, imposed by the OS on the disk controller; several "raw disk devices" can reside on the same disk, and can overlap; typically, one such device represents the whole drive, and others are partitions.

Any work-around for non-Lion-supported HP LaserJet printer?

I just upgraded to Lion, and while love many of the features (the new mail app is great), I just discovered that my 6-month-old HP LaserJet CP1525nw printer apparently isn't compatible with Lion. Does anyone have any work-arounds for generic drivers that might resolve this. As inexpensive as Lion is, I'd hate to have to buy a new printer just so I can take advantage of Lion funcationality and full iCloud capabilities. Thanks.

In preparing to install the drivers for the CP1510 series, I decided to download and reinstall the package for the CP1520 series. First, I also installed the firmware update, which had been released since I purchased my printer. Then I reinstalled the drivers using System Preferences, etc.
Lo and behold, the printer now works. For some reason, after the upgrade to Lion, the drivers for my CP1525nw stopped working, even though all of my other printers (1610, 2510, 2610, 2605dn) performed just fine without any jiggering after the Lion upgrade.
Curiously, my first attempt to download the software package for the CP1525nw wouldn't download, launching a dialog that says the driver isn't supported for this operating system. The HP website does not include the CP1525nw in the list of supported LaserJets, but elsewhere paradoxically claims all printers supported for Snow Leopard should also run on Lion, which appears to be true for the CP1525nw.
Go figure. Anyway, thanks for the suggestion. It got me headed in the right direction.

10.10.4 update allows enabling of TRIM support for non-Apple SSDs

Careful with Trim and Samsung SSD's.
https://blog.algolia.com/when-solid-state-drives-are-not-that-solid/

http://arstechnica.com/apple/2015/06/latest-os-x-update-allows-you-to-enable-trim-for-third-party-ss...
This topic first appeared in the Spiceworks Community

ISight not working for non-Apple apps under particular user account

I noticed that my iSight built into Macbook Pro 15" is not working anymore for non-Apple apps (Skype and Webex at least) and working for Facetime and Messages Beta under same account.
I tried to test it using different account on OS X with Skype and it is working great!
I'm using 10.7.3.
Any advice?

Hi,
I take it that in System Information the camera is listed under USB items ?
Your speps say OS x 10.7.2
Have you updated to OS X 10.7.3 ?
If you have I would start with that by doing a COMBO Version (Not using Software Update)
This will be everything that has been updated since OS X 107 came out and may catch those hard to trace issues.
Using the FInder > Go Menu > Hold the ALT key and Select the Library that appears > then navigate to Preferences.
In here find the Skype .plist.
Open it with Quick Look.
Can you capture that (Apple/CMD ( or ⌘) + Shift + 4 together (Also tap space bar at the end to get the Window) ) ? and post it here.
I don't use Skype and don't have the .plist to see if it lists the camera.
If it does it might pay to delete the.plist and force Skype to re-***** the hardware. (It also depends how much of your other settings are in there)
In the meantime if you go to the Skype Preferences can you see a Preview of the camera ?
Can you turn Off access to the camera and turn it On again in Skype ?
Skype does use Flash Player to do the Video.
Is Webex a browser led thing that uses Flash ?
If it looks like it is a Flash Issue do you have the GoogleTalk Video Plugin installed (there is a standalone and it is part of Chrome) ?
9:08 PM Saturday; February 18, 2012
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
 iMac 2.5Ghz 5i 2011 (Lion 10.7.3)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
"Limit the Logs to the Bits above Binary Images."  No, Seriously

Why can't the Utility function's 'Erase free space' create temporary file

I've been using erase free space without problem for some time.. Then today when I tried to use it, got an error message to say that erase free space won't work because it can't create a temporary file. I have a 320 GB MBP with 88 GB of free space.
I'd love you forever if you can help me get round this issue

Here's what I tried to say in my response that I wasn't authorize to make:
I can't seem to reply to your response BD . . . says I'm not authorize . . . so I'll try to reply to my original post.
Thanks BD for your reply. Here's the info on the drive: 1.3 TB capacity with 1,017 GB available. Eventually I will recycle the computer at Best Buy who guarantees the hard drive will be erased. I just want to get all my files off first. I'll just do another Erase Free Space and see, as you suggest, if there are any files to be zeroed out. Maybe there aren't any. I've extracted most of what I want but am debating how to move the entire iPhoto library to an external drive so I can access it from my Mavericks machine. Can I just drag and drop the iPhoto Library, or do I need to export it somehow?

How can I erase My hard drive. Disk utility only gives me the option of erase free space. I have 27in iMac with Lion and 12 gb ram.

How can I erase my hard drive? Disk utility only gives me the option to erase free space.
Thanks for any assistance.

Drive Preparation for Lion
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. Select Disk Utility from the main menu and click on the Continue button.
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. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed.
4. Quit DU to return to the main menu.
5. Select Reinstall Lion then click on the Continue button. You need an active network connection in order to download the Lion software.

'erase free space' not secure - it doesn't seem to work?

Just wanted to point out that the erase free space option in Mountain Lion does not seem to work, at all.
A week ago I ran erase free space on my primary data drive then later, out of curiosity, I ran an inexpensive third party recovery program on the disk just to see what happened. Interestingly enough the recovery software was able to find and restore files that I had deleted over a year ago.
This has me thinking, so today I tried it again, only with a 7 pass erase this time. Nope, same thing. After a 7 pass erase (erase free space) this low end, less than $35 recovery software turns up tons of files, everything from stuff I just deleted a few days ago to stuff from over a year ago.
If I'm doing something wrong I would love for someone to point it out to me. Not that I'm toting state secrets or anything on my mac, but still - my privacy is important to me and I assume it is to others.
I'd encourage folks to try this out for themselves.
My set up is a 2011 macbook pro with an SSD as the boot drive, I've got a second harddrive installed in the optical bay and this is where my home folder lives. The secondary drive is the drive where I'm running erase free space.
The only thing that I can think of is that, even though the button is not greyed out, maybe I need to be booted to recovery in order to succesfully run erase free space on system drives?
Any input would be greatly appreciated, otherwise this seems like a pretty ugly security lapse on the part of Apple. Imagine if you're selling your machine and secure erasing before turnign it over to its new owner - and the new owner can run a $35 dollar recovery program and access everything on your machine.
Not good.

Thanks for your response, William.
I think that the issue may have to do with being booted to the system while trying to erase free space. I ran a 7 pass erase free space on a 1TB external Lacie drive this afternoon, the operation took a bit over 6 hours to complete and recovery sofatware is turning up nothing.
This is in contrast to the main drive, which my original post referenced, which is a 500gb 7200 rpm internal drive. A 7 pass secure erase took less than 5 minutes to complete - so, even though the drive is 1/2 the size, there's obviously something not right with the 7 minutes time to complete.
Tomorrow I'm going to try either booting to another account (which doesn't utilize this partcular disk) or booting to recovery and seeing what happens.
I have a feeling that this will solve the problem - I'll post back tomorrow evening.

Erase free space in Disk Utilities grayed out for SSD

Is it normal that this function (erase free space) does not work for a SSD? It is grayed out on my iMac for SSD not for the 1 TB HDD.
Now that I installed Lion and Trim is working (on original Apple SSD) in my iMac I would like to erase free space. I read somewhere that you should do this if you did not have the Trim option before and you do have it now. Or is this BS?
peterwillem

Take a look at this link, https://discussions.apple.com/thread/3210131?start=0&tstart=0

Help! iMac performing in erase free space for over 14 hours!

How long should 7-pass 'erase free space' of 69.9 GB take?
I'm giving my old iMac G4 to a young relative. After completing 'erase and install' of OS 10.4, to be sure data would not be easily accessible, I read a few threads in the Installation and Setup forum and decided to do a 7-pass erase of free space.
The message in the Disk Utility window counted down from 8 hours and then switched to "secure erasing file". The blue progress bar doesn't appear to be progressing but is stuck about 1/2 cm from the end.
It's now been going for 14 hours. This seems an extra-ordinarily long time, 'though, for all I know, zero-ing out could take 2 hours. Thinking back, I clicked on 7-pass twice, once via 'security options' then via 'erase free space'. Was that a major mistake?
Is 14 hours too long? And, if so, is it too late to click on 'skip'?

Well, I pressed 'skip' and little changed except that it reported "skipping", whatever that means. So I took courage in both hands, as it were: one to press 'quit' and the other to press 'continue' and ignore the warning that quitting could cause irreparable damage to the HD.
As far I can see, no problem but I'm going to run Drive 10 before I erase-and-install OS X again just so that I can command-Q setup assistant and leave my young relative to set it up for herself.
Many thanks for your help, both Toms too. I guess this question can be logged a 'solved'.
Anne

"Erase Free Space"- DU Not Responding?!

     Started "Erase Free Space" in disk utility about 36 hours ago. I had nearly 1TB of free space which I knew was more than the usual amount someone has when they perform this task but I was attempting to speed up game playing as after a year or so, excess of deleted saved games and game data has gradually slowed game performance down some. I read that this might help so I ran it...
     It took 24 hours to do the initial run through up until the "creating temporary secondary file" notification. It looked as though it was about to complete and I received the usual error message that apple says to ignore about no remaining free space or something to that effect. However, out of nowhere the spin wheel started, the Disk Utility window went grey and everything seemed to have frozen.
     After reading several peoples experiences with things like this I was confident that it would resolve in a few minutes, maybe half an hour even and then most likely resolve itself. It was late so I went to bed and when I got up it was still in the same place as I left it...greyed out and spin wheeled.
     So then I went to the Activity Monitor to check the Disk Usage as I knew that I could view the progress through that. As far as I'm aware, after creating the temporary file, as it already did, it is supposed to start looking like free space is "disappearing" as it puts the recently overwritten free space into its newly created temp file and then eventually deletes the file.
     Problem is, the Activity Monitor shows the Disk Utility as "Not Responding" along with Safari and Mail having the same message, yet at the same time I see the free space on my HD SLOWLY (20-100kb/s) doing that "dissapearing" act. So is the Disk Utility doing its job? Is it hung up some how? If it is working then why is it moving at such an incredibly slow rate? Should I be concerned or take some sort of action or just wait while this resolves itself in who knows how long from now?
Advice on this would be very much appreciated as I am not a very experienced Mac user.

apple customer 1 billion wrote:
There aren't that many files to lose in the long run. It's more a matter of avoiding the risk out of convinience for not losing the few that I have. So correct, I have no back up since there isn't much to back up, hence the nearly 1TB of overwritting free space in the first place. Unfortunately, I realized just how long this process takes after I began it, and now it seems to late...
If I did restart, what would likely happen?
Possibilities I've come across:
1.won't be able to log in because theres no more free space
2.I'd have to search for the temp file and manually delete it (provided I had some extra space to do it)
3.might lose all data and have to reinstall everything
Could be any or all 3
Is there a safe way to either:
1.Restart with little to no complications listed above
2.Safely end this task without some sort of unfixable complication occuring
3.Boost its processing so that I can resonably wait it out
There may not be, but I might as well check around before I go straight to Restart is what I was thinking.
No, no and no unfortunately, patience or a leap of faith are the choices

Time Capsule full after a "Erase Free Space" using Disk Utility

Hello,
I am facing some issues related to my Time Capsule.
Reviewing my past, I had a lot of backups on this, using Time Machine and it always worked pretty well. But after deleting some backups manually to reclaim disk space, this was not exactly freeing it.
Searching in the forum here, I saw that I could mount the backup sparsebundle image and map it into the Disk Utility. This always worked greatly too both for disk checking and reclaiming the space back.
The problem starts on the last Friday when I performed the operation again, but it started using the whole free space that I had and did not give it back.
Studying the case I found that it creates a temporary folder to store the file it creates to write the byte 0 on the disk. This file actually resides in the sparsebundle image and therefore I can see the file with 200GB, for example, in the Finder, this is a split in bands (8MB) just like the backup is. After the disk gets full, the Disk Utility should delete the file properly and give me back the space safely.
Right now my Time Capsule has 0 byte free and I can't do anything on it beyond redo the the Erase Free Space operation. When I do it, it starts writing the temporary file again and the problem repeats itself.
I know that if I backup the data and really erase the disk, I'll get it back, but this is not an option for me because I want a smart solution for this.
The only thing that changed between when it worked and now is the 10.5.6 update that I made and I'd like that it's not the root of the issue.
Is there any suggestion or general stuff I could do to fix it?
Did anybody already face the same issue?
If anyone needs more details to help me out of this, just let me know.
Thanks and regards,
Eduardo

Just another thing to add, I'd like a good solution for this as the redo operation from Disk Utility takes around 2 days and then it just "dies".

Disk Utility Erase Free Space Option Nonexistant

Have an iMAC 1 GHZ PowerPC G4 256 MB DDR SDRAM OS 10.3.9. According to various google results I should be able to call up Disk Utilities>Partition>Erase>Erase Free Space. Its not there. (Its exactly where it should be on a nearby G5 running 10.5.8.).
It will allow me to erase the entire disk or either of two partitions but the Erase Free Space isn't just grayed out, it is completely missing.
1) The hard drive was partitioned at some point in the past I think to get around some admin thing. One partition has 51 out of 60 GB filled, the other has 12.4 of 16.3 GB filled.
2) Don't ask about the admins, my Entourage has been broken for 9 months - I am not joking.
3) My computer knowledge is spotty - you've been warned.
Help!

Try starting the iMac in Target Disk Mode while attached to one of your newer computers with a firewire cable. This basically makes the iMac an external hard drive. I've not tried this but you should then be able to use a newer version of Disk Utility on that drive.
[How to use FireWire target disk mode|http://support.apple.com/kb/HT1661] includes description of hardware and software requirements.
[What to do if your Mac doesn't enter FireWire Target Disk Mode|http://docs.info.apple.com/article.html?artnum=75414], also read about [Open Firmware Password Protection|http://www.apple.com/support/downloads/openfirmwarepassword.html] which can disable Target Disk Mode.
I'm not a technician but I don't think it "misses" areas, it's just more a matter of covering up what was written there before. Think of it as you write something on a piece of paper, then erase it and write something down in the same space. If you look closely you can see what was written there before. Now erase that again and write something else. It'll be pretty difficult to make out what was written there the very first time. Do that 7 times and it will be very, very, very difficult. Do that 32 times and it will be impossible. However, all that erasing and writing will take its toll on the paper and take a long time. I'd say anything more than a erase once would really have to be justified by very sensitive data. Anybody wanting to recover the data would have to use pretty specialized equipment.

Erasing Free Space on boot drive

I am getting ready to sell my older Mac Book Air with a SSD. I would like to erase all free space on the drive to assure that any confidential data I hadn't securely deleted earlier is not recoverable. In my most recent cleanup, I moved all my own files and installed apps to the trash and attempted to empty the trash securely. When the number of files to be removed was down to 30,000 (from neaerly 100,000) it stopped securely removing them. I rebooted several times and those files were still in the trash. I attempted each time to securely empty the trash. It would pop up the progress dialog box but would immeidately close it cleaning up nothing. Finally, I switched to non-secure and emptied the Trash.
I've done to the Disk Utility, selected the SSD Drive (Macintosh HD) and selected the Erase tab. The Erase Free Space button is disabled. How can I securely clean up the free space so that whoever buys the system will not be able to recover whatever, confidential data may still be hanging around in the free disk space list?
Thanks,

read this article, it is outdated, but the info in it is still relevant: http://support.apple.com/kb/TA24002. Do a 7 pass erase. That conformed to the U.S. Department of Defense's security procedures until they changed their rules to that of completely destroying hard drives physically instead.

I need to erase free space on my hard drive. But when I am in disk utility the format and name are pale as is the erase free space button so I cannot erase free space.

My start up disk is full. I have been through my computer and erased a lot of music and video to free some space. I then went to disk utility to erase free space and find that the erase free space button is pale and therefore won't work. Nor can I select or deselect MacOS extended journaled.
Advice please?!

Recovering Disk Space
If you have less than 20% disk space then it is time to roll up your sleeves and search for what you can delete and what you can offload to another disk.
If you have less than 10 GB you definitely need to delete or offload some files or purchase a lager disk or SSD (see below). You may want to maintain at least 20 GB of free space so when your disk starts filling again it will have some room before it hits that 10 GB mark again. More headroom is better. If you let the space fall much below 9 GB you might not be able to boot your machine.
Initial easy steps to gain disk space:
- Delete all files in the Downloads folder.
Empty the Trash.
- Start iPhoto.
Empty its trash.
Restart.
- Restart in Safe Mode:
Restart the computer.
As soon as you hear the chime press and hold the right shift key.
Be patient. Hold it down until you see the Apple icon.
Empty the trash.
Restart in normal mode.
- Delete "Recovered Messages", if any.
    Hold the option key down and click "Go" menu in the Finder menu bar.
    Select "Library" from the drop down menu.
    Library > Mail > V2 > Mailboxes
    Delete "Recovered Messages", if any.
- Empty the Trash.
- Restart.
- Re-index your system disk (Macintosh HD):
http://support.apple.com/kb/ht2409
Time Machine Snapshots:
If your disk is 80% full that is normal. Time Machine uses up to 80% of the disk space for local snapshots. To get rid of these snapshots simply plug in your Time Machine backup drive and run a backup. See About Time Machine's 'local snapshots' on Mac notebooks: http://support.apple.com/kb/HT4878 and What are Local Snapshots? http://pondini.org/TM/30.html .
If you are concerned that the “Other” category of disk usage is taking too much space and for information on deleting files then look here: https://discussions.apple.com/docs/DOC-5142
Backup:
Run a Time Machine (or other) backup since you are about to delete and move files and you may need to recover from any inadvertent mistakes or decisions. You will need one external hard drive for your Time Machine (or other) backup and a second if you plan to offload some files. (See suggestions for where to purchase hard drives at the end of this message.)
For more about backups:
Time Machine Basics: http://support.apple.com/kb/ht1427
Most commonly used backup methods:
https://discussions.apple.com/docs/DOC-3045
Methodology to protect your data. Backups vs. Archives. Long-term data protection:
https://discussions.apple.com/docs/DOC-6031
Deleting files:
Then use the free application OmniDiskSweeper http://www.omnigroup.com/more to explore your volume in descending order by size so you can attack the problem from the top down, deleting the largest unwanted files first. Delete with caution and do not delete any system files. Remember to empty the trash after trashing the files.
Additional reference on freeing disk space:
http://pondini.org/OSX/DiskSpace.html
Offloading files:
Consider moving some of the no-often-used large files or directories to an external disk. Use ODS again to find them. As noted above this will be at least your second hard drive. Your first one(s) is/are for your Time Machine (or other) backup(s). Do not offload files onto a Time Machine disk.
Format the second drive as Mac OS Extended (journaled). Using OWS to find large files/folders and copy them from the system drive to the external hard drive and delete them from your internal drive.
Then  > System Preferences > Time Machine > Options… > Remove the offload HD name from the exclusions list.
Now both your system disk and your external offload disk will be backed up onto your Time Machine disk.
From: http://www.thexlab.com/faqs/freeingspace.html
To move your iTunes Music folder to another disk or partition:
To change the location of your iTunes Music folder, carefully follow the instructions in the AppleCare® Knowledge Base document "iTunes for Mac: Moving your iTunes Music folder."Additional information can be found in iTunes Help.
http://webcache.googleusercontent.com/search?q=cache:http://www.thexlab.com/105/ 00000849.html
Laptop users may want to consider having two iTunes libraries: a small library of current favorites on their computer, while their complete library resides on an external hard drive. Utilities like iTunes Library Manager enable you to easily have multiple iTunes libraries you can use with your account. https://www.macupdate.com/app/mac/7689/itunes-library-manager
To move your iPhoto Library folder to another disk or partition:
To move the iPhoto Library folder to a new location, employ the instructions in the AppleCare Knowledge Base document from http://support.apple.com/kb/PH2506 corresponding to the version of iPhoto you are using. Additional information can be found in iPhoto Help.
Laptop users may want to consider having two iPhoto libraries: a small library of current, favorite photographs on their computer, while their complete library, or archives of older photos are saved on an external hard drive. Utilities such as iPhoto Buddy and iPhoto Library Manager enable you to have multiple iPhoto libraries that you can use with your account.
https://www.macupdate.com/app/mac/12175/iphoto-buddy
https://www.macupdate.com/app/mac/7158/iphoto-library-manager
Hardware — Bigger disk/SSD:
If your system has upgradeable storage then if you are still tight on disk space consider larger storage. If you have a disk consider replacing it with a one TB disk. Check out a one terabyte HGST 7K1000 7200 rpm, SATA III drive from OWC http://eshop.macsales.com ($100). If you have an SSD consider increasing its capacity to 240 or 480 GB. A standard 240 GB SSD would cost from $200 to $280. See OWC and Crucial: http://www.crucial.com/ for options. OWC sells 120, 240 and 480 GB SSD upgrades for MacBook Airs. A 240 GB upgrade costs $265.   http://eshop.macsales.com/shop/SSD/OWC/ . If your Mac is under warranty or AppleCare replacing the SSD will void the warranty.
PlotinusVeritas gives some great suggestions for purchasing external hard drives in this thread:
https://discussions.apple.com/thread/5602141?tstart=0

"Erase Free Space" work-around for non-apple ssd

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