Hitachi Teases With 400GB HDD

[Bluehail]

The Pr0nstar 7K400 sounds like a more applicable name

[Shockedder]

When is the little 1Tb baby coming ?
I'm up for that. :D
On another note , bigger is better , NO ? :p

[bob05]

RAID array anyone? ;)

[neverwhere]

RAID array? Overkill much? :p

[_Mystical_Night]

*drool* too bad its probly going to be really really expensive ... possibly as much as the WD raptor drives

[sm8000]

Anybody know the storage limit with 48-bit LBA? My math ain't up to snuff.

[Terminator]

48 bit limit will be 2^48 = 281474976710656 bits

Converting to Terabytes will be 281474976710656/(8*1024*1024*1024*1024) = 32TB

Of course some manufacturers use 1000 rather than 1024 to convert which is why when you format say a 120GB drive it shows up as less than 120GB..usually it'll show up as slightly over 114GB. Using the same maths a manufacturers quoted 500GB drive will show up as approx 477GB!

T

:t

[crimsonoa]

You loose space when formating too.

[Cyan]

Originally posted by crimsonoa
You loose space when formating too.

about 8megs with XP I think.

[causticVapor]

Originally posted by _Mystical_Night
*drool* too bad its probly going to be really really expensive ... possibly as much as the WD raptor drives

:eek: as much... probably about twice as much...

look at the price of the 300GB maxtor :eek:

[richard_cocks]

Originally posted by Terminator
48 bit limit will be 2^48 = 281474976710656 bits

Converting to Terabytes will be 281474976710656/(8*1024*1024*1024*1024) = 32TB

Of course some manufacturers use 1000 rather than 1024 to convert which is why when you format say a 120GB drive it shows up as less than 120GB..usually it'll show up as slightly over 114GB. Using the same maths a manufacturers quoted 500GB drive will show up as approx 477GB!
:t

465GB by my maths :p

[Terminator]

Obviously I didn't mention when manufacturers started using x1000 for advertising their hard drive capacities.

Not going to get involved in a maths debate but the brief history is :-

8 bits to the byte
1024 bytes = 1 kilobyte
1024 kb = 1 Megabyte (here some,not all, manufacturers used 1000)
1024MB = 1 Gigabyte (most if not all manufacters used 1000)
1024GB = 1 Terabyte.

Using this a TRUE 500GB drive would be 500*8*1024*1024*1024 bits
Using manufacturers guide 500Gb = 500*8*1024*1000*1000 bits. = 4096000000000bits.

Using true conversion back to GB =(4096000000000/(8*1024*1024*1024) = 476.8GB ~ 477GB

Using this same conversion gives me EXACTLY the capacity my Seagate 120GB drive shows up as.

I understand where you got 465Gb , probably my fault for not pointing out that they all use 1024 to calculate the number of bytes.

T

:t

[richard_cocks]

so they use 1024B for a KB? why do they do that then use 1000KB for a MB?

[Terminator]

Good question. Only answer is they can advertise higher capacity drives than they actually are. My 120GB drive formats as 114GB...6GB 'lost'. I first noticed this disparagies when drives moved above 20GB. In the days when I first built computers the drive capacities were 20-40 MB drives and they formatted exactly as stated. When they hit 20GB they still formatted as exactly 20GB but once I had drives over 40GB I noticed this 'lose' in capacity and tried to work out where it had gone and stumbled on an article which explained it.
I just put it down to marketing. If you have a drive over 40GB try the equation and I bet you it comes extremely close to the formatted capacity.

To save the maths :-

60GB ---> 55.879GB
80GB ---> 76.294GB
100GB --> 95.367GB
120GB --> 114.441GB
140GB --> 133.514GB
160GB --> 152.588GB
'
'
'
400GB --> 381.490GB

T

:t

[gjimene2]

It sucks that most manufacturors label their systems in the "unformated capacity"


The 400GB drive would be good to also use in digital surveillance systems.

[_Mystical_Night]

you forgot 250 gigs :p

I hope this brings down the value of current hard drives even more :p i want like x8 hard drives :x :x