Re : Flash Storage (Drive size)

I was wondering how many gb does a harddrive/ssd actually has after formatting , google search wont help , I don't know what is called. eg 32 , 64 , 128 , 256 , 512 , 1tb but that isn't the actual size , probably 2-3gb less for drive data itself? Can anyone list me the actual capacity?

 

agility 3 60GB -> 55GB*
vertex 3 120GB -> 119GB
crucial m4 256GB -> 238GB

thats my experience so far...it'll be pretty accurate across all drives.

*i may or may not have done something wrong to this drive.

ps,

60/64GB = same size drive
120/128GB = same size
240/256GB = same

EDIT: the ps section is wrong - apologies

 

To get the "actual" capacity, take the advertised capacity and divide it by 1.024 three times.

 

Consider around 93% of advertised capacity, if you want the exact amount, see post above.

 

Not true, 64GB drive actually is bigger then 60GB.

 

or, you could save yourself some time and divide by 1.074 one time.

The manufacturers use 1,000,000,000 bytes (10^9 bytes) = 1 GB. Your computer (and the rest of the earth) considers 1,073,741,824 bytes (2^30 bytes) = 1 GB. This is the nature of the discrepancy.

So:

60 GB / 1.074 = 55.x GB
128 GB / 1.074 = 119.x GB
256 GB / 1.074 = 238.x GB

---

If the manufacturer specifies 60 GB, that's different than the manufacturer specifying 64 GB. The 64 GB drive will have 59.x GB on your computer. Similar case with any size drive. If the drive size is specified in GB, just divide by 1.074. When drive sizes start getting measured in TB, you'll need to divide by 1.1. Hope that helps.

 

^^ hmm I always thought 60/64 were the same due to reserve capacity....

so is there actually more than 256GB in say an M4? I assume it needs to provision some for reserve... or is advertising at 240GB more 'truthful'

 

The M4 doesn't use overprovisioning. As such, the entirety of the drive's NAND is user accessible. Technically, a 240GB drive has the same total capacity, but that extra 16GB cannot be accessed by the user, only by the controller because of overprovisioning. So from a practical standpoint, the 240GB drive has less usable capacity than the 256GB one.

A 240GB drive will have a capacity of ~223GB in windows and a 256GB drive will have a capacity of ~238GB.

 

Thanks everyone Rep+ , may i know how about those flash drive/usb/mmc. 2gb 4gb 8gb 16gb etc , / 1.074 too?

 

son of a ....no wonder the 55GB number looked funny to me. -_-

 

It will be the same. The 32gb SD card in my phone shows up as 29.something gb, and the 64gb SD card in my tablet is ~59gb. I don't know why RAM manufacturers can get it right that 1gb = 1024mb, but HDD manufacturers can't. Well I do know why, it's called giving you less and advertising it as more.