Hey guys, The drive manufacturer and operating system calculates a Gb. in different ways: The drive manufacturers uses a unit of 1000 while the rest of the world uses 1024 for doing all the K,M,G,T (Kilo, Mega, Giga & Tera) bit math. Hence, 80 Gb drive to the manufacturer is 80,000,000,000 bits. But in reality a true Gb is 1024 x 1024 x 1024 = 1,073,741,824 bits, so if you do the math you would see that 80,000,000,000 bytes is actually 74.5059Gb. ( actually 74.50580596923828125 bits :) )
Its just a numbers game used by the drive manufacturers, but you are not losing anything, just the difference in the numbers. You said it shows 70 gig in available space, the missing 4 Gb is the reserved space for the fat, and the 181 Mb is the used space of it. On Nov 8, 2007 8:34 PM, Rajshekhar AP <[EMAIL PROTECTED]> wrote: > On Thursday 08 November 2007 19:49, aniket gadgil wrote: > > Hay Saifi, > > I m not expert but whatever i have heard that The HDD is measured not in > > GigaBytes but in Gigabits. Thats why when u calulate all the 80 GB in ur > > hard disk u get it 74 GB i.e 80 Gigabits = 74 Gigabytes.. > > > > Well i am not sure about this.. > > if this is wrong then whenever u get right answer plz tell me that too.. > > > > Thank you, > > Aniket > > > > On 11/8/07, Saifi Khan <[EMAIL PROTECTED]<saifi.khan%40twincling.org>> > wrote: > > > Hi all: > > > > > > why is only 74GB available on a 80GB seagate IDE hard disk ? > > > > > > After creating a single ext3fs partition, here are the stats. > > > > > > Filesystem Size Used Avail Use% Mounted on > > > > > > /dev/hdb1 74G 181M 70G 1% /data2 > > > > > > Currently, there is no data, so 181M used is perhaps metadata ? > > > > > > If so, why the available space is only 70GB ? > > > > > > Is this a bug ? > > > > > > thanks > > > Saifi. > > > > [Non-text portions of this message have been removed] > > Hi Saifi > > I also remember reading the same reason in PCWorld. > > AP > > -- Cheers, John [Non-text portions of this message have been removed]
