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- From: dic5340@hertz.njit.edu (David Charlap)
- Newsgroups: comp.os.os2.misc
- Subject: Re: Improving OS2 performance question
- Message-ID: <1992Jul24.184100.16837@njitgw.njit.edu>
- Date: 24 Jul 92 18:41:00 GMT
- References: <rdippold.711752699@cancun> <1992Jul23.000725.2784@news.Hawaii.Edu> <1992Jul23.115032.25568@actrix.gen.nz>
- Sender: news@njit.edu
- Organization: New Jersey Institute of Technology, Newark, N.J.
- Lines: 35
- Nntp-Posting-Host: hertz.njit.edu
-
- In article <1992Jul23.115032.25568@actrix.gen.nz> Steve.Withers@bbs.actrix.gen.nz writes:
- >
- >I've been running HPFS only since April 27th and haven't had *any* problems
- >with HPFS. It is faster, better and you can fit more data on too, because it
- >uses 512byte blocks instead of the usual 2k or 4K (I forget which) that FAT
- >uses.
-
- FAT uses "clusters" as the allocation units. A cluster is a
- power-of-two multiple of the sector size (512 bytes). A 360K floppy
- uses 1K clusters (2 blocks), other floppies use 512 byte clusters.
- Hard drives use the smallest sized cluster they can - there is a
- maximum of 64K clusters on a disk, so 512 byte clusters max out with a
- 32MB drive. A 64MB drive will use 1K clusters. A drive bigger than
- 64M, but less than 128M will use 2K clusters, etc.
-
- So, as your drive gets bigger, the overhead to using FAT increases
- exponentially.
-
- For comparison, HPFS uses about 5% of your total disk space (any size)
- for internal usage, and always allocates in units of one block (512
- bytes on a PC).
-
- A big drive with a lot of small files will be able to hold more on
- HPFS than FAT. A small drive with a small number of big files may be
- able to do better under FAT.
-
- Note that this argument is ignoring speed. This is just computing the
- effective storage capacity of a given drive.
-
-
- --
- |) David Charlap "I don't even represent myself
- /|_ dic5340@hertz.njit.edu sometimes so NJIT is right out!.
- ((|,)
- ~|~ Hi! I am a .signature virus, copy me into your .signature file.
-