Multiple versions of Photoshop ok? Conflicts? Hard drive space?

CS4 and CS5 Extended are currently installed on my computer, along with extensive number of third party plug-ins. I'm already encountering problems opening CS5 Extended--takes 2-3 tries before it actually opens; get "not responding" message first couple of times and have to force quit. Am concerned that purchase and installation of CS6 Extended will further complicate matters. Should I uninstall them before installing CS6 Extended? I currently have multiple Photoshop CS4 and 5 folders, etc in my Applications folder. Am thinking a clean-up is in order but thought I'd get advice before proceeding with CS6 purchase and attempt at clean-up. Also, if applicable, I have multiple Lightroom folders as well (2, 3, and 4) and am now having issues jumping over to Photoshop for additional editing from there. Thx

Yes, multiple versions mess with file associations. That's all it comes down to and pretty much the source of your troubles. Other than that there is no reason why one couldn't have multiple versions running, but feel free to consolidate and remove older versions....
Mylenium

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    1 TB (Terabytes) 1 * 10004 B 0.9095 TiB (Tebibytes) 0.9095 * 10244 B
    1000 GB (Gigabytes) 1000 * 10003 B 931.3 GiB (Gibibytes) 931.3 * 10243 B
    1,000,000 MB (Megabytes) 1,000,000 * 10002 B 953,674.3 MiB (Mebibytes) 953,674.2 * 10242 B
    1,000,000,000 KB (Kilobytes) 1,000,000,000 * 1000 B 976,562,500 KiB (Kibibytes) 976,562,500 * 1024 B
    1,000,000,000,000 B (bytes) - 1,000,000,000,000 B (bytes) -
    Microsoft Windows reports disk capacity both in a decimal integer to 12 or more digits and in binary prefix units to three significant digits.
    The capacity of an HDD can be calculated by multiplying the number of cylinders by the number of heads by the number of sectors by the number of bytes/sector (most commonly 512). Drives with the ATA interface and a capacity of eight gigabytes or more behave as if they were structured into 16383 cylinders, 16 heads, and 63 sectors, for compatibility with older operating systems. Unlike in the 1980s, the cylinder, head, sector (C/H/S) counts reported to the CPU by a modern ATA drive are no longer actual physical parameters since the reported numbers are constrained by historic operating-system interfaces and with zone bit recording the actual number of sectors varies by zone. Disks with SCSI interface address each sector with a unique integer number; the operating system remains ignorant of their head or cylinder count.
    The old C/H/S scheme has been replaced by logical block addressing. In some cases, to try to "force-fit" the C/H/S scheme to large-capacity drives, the number of heads was given as 64, although no modern drive has anywhere near 32 platters.
    [edit] Formatted disk overhead
    For a formatted drive, the operating system's file system internal usage is another, although minor, reason why a computer hard drive or storage device's capacity may show its capacity as different from its theoretical capacity. This would include storage for, as examples, a file allocation table (FAT) or inodes, as well as other other operating system data structures. This file system overhead is usually less than 1% on drives larger than 100 MB. For RAID drives, data integrity and fault-tolerance requirements also reduce the realized capacity. For example, a RAID1 drive will be about half the total capacity as a result of data mirroring. For RAID5 drives with x drives you would lose 1/x of your space to parity. RAID drives are multiple drives that appear to be one drive to the user, but provides some fault-tolerance.
    A general rule of thumb to quickly convert the manufacturer's hard disk capacity to the standard Microsoft Windows formatted capacity is 0.93*capacity of HDD from manufacturer for HDDs less than a terabyte and 0.91*capacity of HDD from manufacturer for HDDs equal to or greater than 1 terabyte.
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