On 11-May-15 13:33, Cory Smelosky wrote: > I repeated the install, fresh structures, repeated TSU install. No > issues this time. > Glad you succeeded. > > Sounds like just a corrupted disk. > That really shouldn't happen, barring a crash of the host hardware, or an unclean shutdown of the OS. Don't do that. > >> Disk space is now so cheap that the easiest way to backup these >> systems is >> to simply copy the SIMH disk images (with the simulator stopped after a >> clean >> OS shutdown.) That's my recommendation for all SimH machines... >> These disks >> are smaller than your typical video (or a couple of hundred photos). >> > > How well do they compress? > Depends on data. Try it and see. Since 36 bits are stored in 64, there's an automatic inflation of 1.8x of zeros.
After that, depends on your data & the compression. Since most text files aren't byte-aligned (7-bit bytes), you should use/set your compressor to allow fairly wide codes (if it's variable width). For common sofware: on a random disk, I've seen 7-zip compress a fairly full disk to 15%, zip to 30% (that's compressed size/input size, so smaller is better.) But it really doesn't matter. The capacity of an RP06 is ~177MB; notebook PCs these days come with 500GB-2TB drives. So you can fit 2,800 RP06s on the 'small' drive; 11,000 on the large ones. OK, divide by 1.8 for 1,500 /6,300. Desktops, network storage tend to be bigger. So a few backup copies of your RP06s really isn't a big deal, even uncompressed. YMWV.
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