I am wondering if there is a utility for the mac that allows you to see the details of an SSD like the health of the drive, TBW (total bites written), how many running hours etc... In researching for an app of such a kind I found (SSDLife) for windows? It looks like to me that a program like this would be exactly what I would need. The most important information that I need to know about is the TBW (total bites written) on the drive. Because I have heard that once an SSD drive reaches a certain amount of writes it becomes a read only drive, so this information would be invaluable to me.
Check out SSD Health on the Mac App Store: http://ssdhealth.com/macos.html
If you're OK with Command Line utilities, you can always use
smartmontools from http://www.smartmontools.org/.
You would need XCode to compile them from source (unless someone here knows binary distribution for Mac OSX), but if I remember correctly I had no issues compiling the package.
I have an OCZ SSD retrofitted into my MBP 15" mid-2010 and I can use
smartctl command to monitor various stats, including your Total Bytes Written (called here Lifetime_Writes) as well as Media Wearout Indicator (shown as percentage).
To give you an idea, here's the example output:
MacBook:~😈 smartctl -a /dev/disk0 smartctl 6.0 2012-10-10 r3643 [x86_64-apple-darwin12.2.0] (local build) Copyright (C) 2002-12, Bruce Allen, Christian Franke, www.smartmontools.org === START OF INFORMATION SECTION === Model Family: Indilinx Everest/Martini based SSDs Device Model: OCZ-VERTEX4 Serial Number: OCZ-xxxxxxxxxxxxxxxxx LU WWN Device Id: 5 e83a97 49c31f44c Firmware Version: 1.5 User Capacity: 512,110,190,592 bytes [512 GB] Sector Size: 512 bytes logical/physical Rotation Rate: Solid State Device Device is: In smartctl database [for details use: -P show] ATA Version is: ACS-2 (minor revision not indicated) SATA Version is: SATA 3.1, 6.0 Gb/s (current: 3.0 Gb/s) Local Time is: Sat Apr 20 23:39:33 2013 IST SMART support is: Available - device has SMART capability. SMART support is: Enabled === START OF READ SMART DATA SECTION === SMART overall-health self-assessment test result: PASSED General SMART Values: Offline data collection status: (0x00) Offline data collection activity was never started. Auto Offline Data Collection: Disabled. Self-test execution status: ( 249) Self-test routine in progress... 90% of test remaining. Total time to complete Offline data collection: ( 0) seconds. Offline data collection capabilities: (0x1d) SMART execute Offline immediate. No Auto Offline data collection support. Abort Offline collection upon new command. Offline surface scan supported. Self-test supported. No Conveyance Self-test supported. No Selective Self-test supported. SMART capabilities: (0x0003) Saves SMART data before entering power-saving mode. Supports SMART auto save timer. Error logging capability: (0x00) Error logging NOT supported. General Purpose Logging supported. Short self-test routine recommended polling time: ( 0) minutes. Extended self-test routine recommended polling time: ( 0) minutes. SMART Attributes Data Structure revision number: 18 Vendor Specific SMART Attributes with Thresholds: ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 1 Raw_Read_Error_Rate 0x0000 006 000 000 Old_age Offline - 6 3 Spin_Up_Time 0x0000 100 100 000 Old_age Offline - 0 4 Start_Stop_Count 0x0000 100 100 000 Old_age Offline - 0 5 Reallocated_Sector_Ct 0x0000 100 100 000 Old_age Offline - 0 9 Power_On_Hours 0x0000 100 100 000 Old_age Offline - 2981 12 Power_Cycle_Count 0x0000 100 100 000 Old_age Offline - 417 232 Lifetime_Writes 0x0000 100 100 000 Old_age Offline - 14566414269 233 Media_Wearout_Indicator 0x0000 100 000 000 Old_age Offline - 100 SMART Error Log not supported Warning! SMART Self-Test Log Structure error: invalid SMART checksum. SMART Self-test log structure revision number 1 No self-tests have been logged. [To run self-tests, use: smartctl -t] Selective Self-tests/Logging not supported
The exact parameters and stats shown for your SSD might vary, but as it's a free tool, you can try and see for yourself!
I have owned a MacBook Pro Retina since August 2012 and it gets modest use, with mainly web browsing and online video streaming as the main uses. As the DriveDX report shows, the SSD is rated at 90% after 3.5 years of use.
My MACs seem to last forever, with an iMac 27" from 2009 still running fine - though I maxed out the memory and replaced the regular hard drive with an SSD this year... Still cranking along after 6 years, so I can see why people may be worried about wearout, but like most things with Macs.. you seem to pay them big money up front and once you have paid the premium, their hardware choices really seem to provide long life for the average mac user...
This isn't a software recommendation (I see there are already a few posted), but more of a tip. Although SSDs do have a shorter "life" than HDDs, it is still by far a longer life than you'd reach with normal conditions. Your SSD will outlast its own desirability and that of the computer it's in, i.e. by the time it craps out, you probably would have wanted to upgrade your computer anyway. Moral of the story: don't worry about it.
From OCZ's FAQ
"...Generally, you should get many years of solid use out of your SSD…"