Where is the additional 12GB?
/dev/disk9
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *500.3 GB disk9
1: EFI EFI 209.7 MB disk9s1
2: Apple_HFS Macintosh HD 499.3 GB disk9s2
3: Apple_Boot Recovery HD 650.0 MB disk9s3
Thanks.
OFF topic: why no preview and no "code" option in this editor?
Message was edited by: Berend de Meyer - changed font
Sounds about right for the formatted drive, here's another example.
Thanks for your reply!
Here are two 840 EVO 500GB SSD's
/dev/disk0
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *500.1 GB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_RAID 499.8 GB disk0s2
3: Apple_Boot Boot OS X 134.2 MB disk0s3
/dev/disk1
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *500.1 GB disk1
1: EFI EFI 209.7 MB disk1s1
2: Apple_RAID 499.8 GB disk1s2
3: Apple_Boot Boot OS X 134.2 MB disk1s3
/dev/disk2
#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS DUO_OSXMAV3 *999.5 GB disk2
They DO show the exact capacity of netto 500GB when formatted. Disk Utility clearly reads this SSD as 500GB SSD.
Disk Description : APPLE SS D SM512E Media
Total Capacity : 500,28 GB (500.277.790.720 Bytes)
So your screen is still no answer to my question where did the 12GB go? Why advertise it as a 512GB SSD while IRL it's 500GB? Just curious! ~ Cheers
You asked about the Apple SSD 512e, so I posted a picture of an installed one that shows the same capacity as you're questioning.
Now you are talking about different drives.
Good luck.
Thanks for your reply! Of course no offence intended regarding your reply. The other drives shown were for reference. I saw it has indeed the same GB readings, but my question also was, where is the additional 12GB. Can't think of a reason why just formatting a drive should cost one 12GB of space.... ~ Cheers
I don't have an 840 to check, and the Apple SSD SM512e is an 830 so not an 'apples to apples' comparison. And don't forget that there are 2 measurement systems, hex and decimal, you can use either but they produce slightly different answers to the same question.
Here's an explanation of the 2 measurement systems in use and why a 400GB drive may actually only be 378GB
Do not be irate about formatted capacity of SSD drives. In addition to the numbering system differences described above, a portion of the total blocks are simply set aside at initialization time. These are used as Operating Spares to give better speeds while running, and may be substituted as spares if defects develop while running.
In a rotating drive, one or a handful of blocks in each "neighborhood" are maintained as non-OS-accessible spares by the drive controller.
It is strongly in your best Interest to have a portion of your SSD capacity set aside for spare blocks. For SSD drives, this set-aside comes from the total capacity of the drive.
Apple SSDs have been using fuzzy math since day one. Reported on www.xlr8yourmac.com and others.
SSD should and Samsung advises, to over provision / allocate (set aside) 11% for spare NAND cells (like you would have space sectors only SSDs don't use sectors, they use pages).
Falls - to me - into worrying about nothing but some spilled milk. I have a dozen by now of the Samsung 840s, and retired some older Intel and Corsair SSDs. Just use 'em. Folks don't like binary system of counting anymore so x'FF' and 1024 is now meaningless except to us old fuddies.
You may want to remove personal information from screen shots. 😉
This is an 840Pro in an external FW/USB enclosure.
As Hatter says, the SSD manufacturers, have chosen to use the Disk Manufacturers' method of 'billions of bytes' rather than powers of 2, to state capacity. But the same manufacturers also build Memory, which they seem to count correctly as powers of 2. Why these double standards? Someone in a board-room could not do binary or hexadecimal calculations and came up with the base 10 system.
Thanks to all for explaining! ~ Cheers
APPLE SSD SM512E Media shows only 500GB available?
