▁se ctors . ▁Some ▁filesystem s , ▁like ▁ext 3 , ▁effectively ▁allocate ▁the ▁free ▁block ▁that ▁is ▁nearest ▁to ▁other ▁blocks ▁in ▁a ▁file . ▁Therefore ▁it ▁is ▁not ▁necessary ▁to ▁worry ▁about ▁fragment ation ▁in ▁a ▁Linux ▁system ." ▁ ▁While ▁ext 3 ▁is ▁resist ant ▁to ▁file ▁fragment ation , ▁ext 3 ▁can ▁get ▁fragment ed ▁over ▁time ▁or ▁for ▁specific ▁usage ▁patterns , ▁like ▁slowly ▁writing ▁large ▁files . ▁Con sequently , ▁ext 4 ▁( the ▁successor ▁to ▁ext 3 ) ▁has ▁an ▁online ▁filesystem ▁def ragment ation ▁utility ▁e 4 def rag ▁and ▁currently ▁supports ▁ext ents ▁( cont igu ous ▁file ▁regions ). ▁ ▁Und e lete ▁ ▁ext 3 ▁does ▁not ▁support ▁the ▁recovery ▁of ▁deleted ▁files . ▁The ▁ext 3 ▁driver ▁act ively ▁delet es ▁files ▁by ▁w ip ing ▁file ▁in odes ▁for ▁crash ▁safety ▁reasons . ▁ ▁There ▁are ▁still ▁several ▁techniques ▁and ▁some ▁free ▁and ▁propriet ary ▁software ▁for ▁recovery ▁of ▁deleted ▁or ▁lost ▁files ▁using ▁file ▁system ▁journal ▁analysis ; ▁however , ▁they ▁do ▁not ▁guarantee ▁any ▁specific ▁file ▁recovery . ▁ ▁Com pression ▁e 3 com pr ▁is ▁an ▁uno fficial ▁patch ▁for ▁ext 3 ▁that ▁does ▁transparent ▁compression . ▁It ▁is ▁a ▁direct ▁port ▁of ▁e 2 com pr ▁and ▁still ▁needs ▁further ▁development . ▁It ▁comp iles ▁and ▁bo ots ▁well ▁with ▁up stream ▁k ern els , ▁but ▁journal ing ▁is ▁not ▁implemented ▁yet . ▁ ▁L ack ▁of ▁snap sh ots ▁support ▁Un like ▁a ▁number