on 6/26/00 1:59 PM, Sidney Ho at [EMAIL PROTECTED] wrote:
Sorry to include all the previous with this. Thanks for all the
clarification Sidney. Only one maby stupid question remains.
If the 4GB hardware based limit is on SCUSI and not ATI devices (such as the
internal drive) then what is the max size of an external drive I can connect
via SCUSI directly to the 2400?
(I am thinking future backup strategy like an external 10GB drive)
> on 6/26/00 9:17 AM, [EMAIL PROTECTED] wrote:
>
>> [EMAIL PROTECTED] replied...
>>>> I have had a major disaster with my 2400. I needed to
>>>> optomize the disk so I mounted the 10gig drive on my G4
>>>> desktop with the powerbook in scisi mode.
>>> You must have a single 10 gb partition drive. The 2400
>>> doesn't recognize much beyond 4 gb due to a known rom
>>> limitation...
>>
>> what limitation is that? i'm running a 9GB drive in my comet, with a
>> single 9GB partition, and i've not had any issues whatsoever.
> The answer lay within the above, but my apologies for being, perhaps, too
> assumptive in my response. The writer explicitly says he mounted his 10gb
> dive with the PB2400c in SCSI mode. Technically speaking, no 2400 is running
> its internal disk in SCSI mode as they are IDE/EIDE drives. SCSI mode
> defines a default condition. If you connect an external SCSI device to a
> PowerBook, you are still running in CPU mode. The other way of getting a
> 2400's internal HD up to a DT computer is networking, but even fast Ethernet
> is much slower than SCSI mode. Personally I run an 18.2 gb HD in my 2400
> with 6 partitions "and i've not had any issues whatsoever" either. That is
> because I do not try to mount it in SCSI mode (but reserve the first two
> partitions at total 4 gb--just in case...). As data loss is the most scary
> and vexing of all computer problems, and HDs are getting bigger all the
> time, at the risk of boring other 'Listers, I'll spend a little time on this
> post to address possible inadvertent damaging of files in SCSI mode with a
> repost of something I replied to on Jan. 24, 1999:
>
> ***
>> DuoList asked on Jan. 21, 1999:
>>> Can someone please clarify for me what the exact maximum size of hard
>>> drive the 2400 can use and still boot up in SCSI disk mode? Is it 4.0
>>> gig, 4.1, 4.3? How many actual bytes? Is it possible to partition a
>>> larger drive and fool it into thinking it's a couple of smaller drives?
>>
>> Good questions for which I could not get answers myself some months earlier.
>> I migrated from an IBM 4.3g to a 6.4g HD on a 2400. The 4.3g
>> after HFS+ formatting came up completely in SCSI mode. The 6.4g was limited
>> to my first 3 of 5 partitions, totaling around 4g. I left #4 as an HFS
>> partition (thinking I might need to link w/HFS drives in SCSI mode) but
>> after reformatting it to HFS+, it also comes up. So in total I have over 5g
>> mounting in SCSI, 4 of 5 partitions.
>> The partitions that do/did not mount came up for initialization. Just select
>> no/cancel.
> ***
>
> To this I would add the following observations / comments. The reason I
> guessed the 10 gb drive in question was a single partition (or the first two
> were less than 4 gb total), was that it came up as 10 gb total. Any
> partition that comes up in SCSI mode exceeding the 4 gb limit needs its
> desktop rebuilt as icons residing in partitions (mildly) over the 4 gb limit
> show as generic. That is why I don't try my 18.2 gb drive in SCSI mode. It
> is also possible that SCSI mode limitations are not responsible for the 7000
> corrupted files. That is far from proven because the writer refers to a
> number of serious problems. I won't get into further troubleshooting but
> there are at least a dozen hardware/software issues that could cause the
> problem(s) and they could be a single issue or multiples. Hardly reassuring,
> but SCSI disk mode could just be a leading suspect--but every 2400 user
> should be very interested in this issue of potentially compromised data
> integrity.
>
>> i seem to remember a limitation in scsi disk mode; is that what you're
>> referring to?
> Yes, both I and the original writer were referring to "SCSI mode" to mean
> "SCSI disk mode". Exceeding the 4 gb limitation may (certainly) raise issues
> unknown to us and Apple, and certainly not worrisome enough to Apple to
> release a firmware patch--wouldn't that be nice?
>
>
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