home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: comp.sys.next.hardware
- Path: sparky!uunet!tcsi.com!iat.holonet.net!bwilliam
- From: bwilliam@iat.holonet.net (Bill Williams)
- Subject: Re: Your only 1+Gig drive possiblities...
- Message-ID: <BxE629.IB4@iat.holonet.net>
- Organization: HoloNet (BBS: 510-704-1058)
- References: <1992Nov6.171903.7481@galileo.cc.rochester.edu>
- Date: Sun, 8 Nov 1992 09:51:44 GMT
- Lines: 68
-
- in SCSI newsgroup, lupe@ukw.uucp (Lupe Christoph at cic) offered some
- specifications he collected regarding this new age of fast 3.5 inch 1
- gigabyte drives. He posted:
-
- DEC HP Seagate Micropolis IBM
- Fujitsu
- DSP3105 C2247 ST11200N 2112 0663-L12
- M2694SA
- Fast SCSI-2 Fast SCSI-2 Fast SCSI-2 Fast SCSI-2 ?
- Fast SCSI-2
- 5400RPM 5400RPM 5400RPM 5400RPM 4316RPM
- 4400RPM
- 250,000MTBF 300,000MTBF 300,000MTBF 200,000MTBF ?
- ?
- 1.05GB 1.05GB 1.05GB 1.05GB 1.044 GB
- 1.082GB
- 20ms max.seek 25ms max.seek 26ms max.seek 25ms max.seek ?
- ?
- 9.5ms ave. ? 12ms ave ? 9.4ms ave
- 10ms ave
- 1ms t-t.seek 2.5ms t-t.seek 1.9 ms t-t.seek 1.5ms t-t.seek ?
- ?
- 264bit ECC ??bit ECC ??bit ECC 64bit ECC ?
- ?
- 512KB cache 256KB cache 256KB cache 512KB cache ?
- ?
- 2yr? warranty 5yr warranty 5yr warranty 5yr warranty ?
- ?
-
- Note that IBM has (announced?) a 0663-E15 with 1.206 GB.
-
- I have benchmarked the DSP 3105 and the 0663-L12. The DEC disk performs
- somewhat
- better than the IBM disk. Sequential reads are much better. The difference
- is most
- noticeable on small blocks (1 sector), for all accesses
- (random|sequential) (read
- |write).
-
- ------ end of quote.
-
-
- Evidentally the fastest drive for raw SCSI sustained throughput
- (especially the outter tracks) is the amazing Maxtor Magic (1GB 3.5")
- spinning away at an astounding 6600 RPM. It (when finalized and shipping)
- will transfer data at 4.2MB/s sustained. I know a person who tested one a
- few moths ago and got less than this (but may have been using test bursts
- less than one megabyte). For measuring rates of throughput on drives
- capable of very fast rates you should make certain your tests last at
- least 1/2 per burst or maybe even one second for the test. This means
- testing a drive with a 4 megabyte single SCSI read/write command... Not
- 500 or 700K as done in the "old days". I have always used 1.5 megabyte
- burts for the last 3 years when doing my benchmarks and will now always
- use 6 megabytes for the next 3 years.
-
- Maxtor seems very very Hot!
-
- If you want a quality drive housing and support hardware you might want to
- try a Macintosh oriented SCSI drive vendor.
-
- Dirt cheap drives illegally sold me two refurbished drives and tried to
- claim they were NEW once. I eventually got my money back but DC drives
- never really appologized for their deceit.
-
- Stick with Mac vendors, or Premium Mac vendors (such as FWB Inc. in San
- Francisco) for your peripherals or you may get burnt one day.
-
-
-