Some updates on my previous post...
Those HP BD07285A25 drives are indeed great -- head seeks are extremely quiet and quick, draw a moderate amount of power (0.8A @ 12V, although a hefty 1.2A @ 5V) and, if properly formatted, they'll work fine even on '030 machines.
But I have to correct about them running reasonably cool... they can get very hot, but it'll take quite a long time -- and they'll stay warm even several hours after shutoff. Looks like they have some thermal inertia...
Still, I'm afraid that all these SCSI-3 drives, when connected to a "lower" interface via an adapter, go into some sort of crippled mode with much less performance than the host's "narrow" interface would allow, not to say the drive's mechanics!
For instance: I've just installed one of these wonderful HP drives inside my 7600/G3/450, to the internal (Fast-SCSI, 10 MB/s) bus, with a common SCA-50 pin adapter. While everything is working flawlessly and the benefit of a very low access time is clearly perceived, according to HDT Benchmark it peaks at a very pedestrian 3.3 MB/s
I was expecting such a 73 GB 10000 rpm drive to top out the interface at 10 MB/s.
On the other hand, the older Quantum Viking 4.5 GB (7200 rpm, native 50-pin) in my dad's 7500 does peak at 8.5 MB/s on the internal bus. If connected to the external port, it goes up right to the interface's theoretical limit (5 MB/s).
Not sure if a "better" (high-byte terminated, etc) adapter would help... I've got one of these for a Fujitsu MAN3367MC (36 GB, Ultra-160, SCA; won't work with regular adapters) and it performed a bit better on the aforementioned machine, peaking at about 3.7 MB/s, but still way below the combo's possibilities...
Those HP BD07285A25 drives are indeed great -- head seeks are extremely quiet and quick, draw a moderate amount of power (0.8A @ 12V, although a hefty 1.2A @ 5V) and, if properly formatted, they'll work fine even on '030 machines.
But I have to correct about them running reasonably cool... they can get very hot, but it'll take quite a long time -- and they'll stay warm even several hours after shutoff. Looks like they have some thermal inertia...
Still, I'm afraid that all these SCSI-3 drives, when connected to a "lower" interface via an adapter, go into some sort of crippled mode with much less performance than the host's "narrow" interface would allow, not to say the drive's mechanics!
For instance: I've just installed one of these wonderful HP drives inside my 7600/G3/450, to the internal (Fast-SCSI, 10 MB/s) bus, with a common SCA-50 pin adapter. While everything is working flawlessly and the benefit of a very low access time is clearly perceived, according to HDT Benchmark it peaks at a very pedestrian 3.3 MB/s
I was expecting such a 73 GB 10000 rpm drive to top out the interface at 10 MB/s.On the other hand, the older Quantum Viking 4.5 GB (7200 rpm, native 50-pin) in my dad's 7500 does peak at 8.5 MB/s on the internal bus. If connected to the external port, it goes up right to the interface's theoretical limit (5 MB/s).
Not sure if a "better" (high-byte terminated, etc) adapter would help... I've got one of these for a Fujitsu MAN3367MC (36 GB, Ultra-160, SCA; won't work with regular adapters) and it performed a bit better on the aforementioned machine, peaking at about 3.7 MB/s, but still way below the combo's possibilities...