can't get writeable access to an external HD...

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i have typical wd external hard drive... writeable before, now, because had been using backup on windows machine, it's read-only... won't using backup on windows machine anymore, need make writeable again.. have not found way on mac...

occurred me had connect again windows machine had been doing backup make writeable again.. , indeed on machine able remove contents np, , save file (& rename hd..) when connected mac again again denied write-access.. remains read-only on mac... how make writeable on mac, please (i'm on 10.6.8..)
(do maybe need in unix? command(s)? can't find way format on mac.. (on windows right-click on , 1 option "format", see no such option on mac when right-click on it..)

thank you...
 

what drive format? if format of drive ntfs, os x not write format natively.

format hard drive using disk utility (which in /applications/utilities folder)
​
choose appropriate format:
​
hfs+ (hierarchical file system, a.k.a. mac os extended (journaled) don't use case-sensitive) ntfs (windows nt file system)
  • read/write ntfs native windows.
  • read ntfs native mac os x [*]to read/write/format ntfs mac os x, here alternatives:
    • for mac os x 10.4 or later (32 or 64-bit), install paragon (approx $20) (best choice lion , later)
    • for 32-bit mac os x, install ntfs-3g mac os x (free) (does not work in 64-bit mode)
    • for 64-bit snow leopard, read this: macfuse 64-bit snow leopard
    • some have reported problems using tuxera (approx $36).
    • native ntfs support can enabled in snow leopard , lion, not advisable, due instability.
  • airport extreme (802.11n) , time capsule not support ntfs
  • maximum file size: 16 tb
  • maximum volume size: 256tb
  • you can use format if routinely share drive multiple windows systems.
exfat (fat64)
  • supported in mac os x in 10.6.5 or later.
  • not windows versions support exfat. see disadvantages.
  • exfat (extended file allocation table)
  • airport extreme (802.11n) , time capsule not support exfat
  • maximum file size: 16 eib
  • maximum volume size: 64 zib
  • you can use format if supported computers intend share drive. see "disadvantages" details.
fat32 (file allocation table)
  • read/write fat32 both native windows , native mac os x. [*]maximum file size: 4gb.
  • maximum volume size: 2tb
  • you can use format if share drive between mac os x , windows computers , have no files larger 4gb.
 


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